Sobre la quitina:
a.
Levaduras.
b.
Virus.
c.
Priones.
d.
Bacterias.
Answers
Answer:
Explanation:
La quitina es un polisacárido estructural grande hecho de cadenas de glucosa modificada. La quitina se encuentra en los exoesqueletos de insectos, las paredes celulares de los hongos y ciertas estructuras duras de los invertebrados y los peces. En términos de abundancia, la quitina es superada solo por la celulosa
Levaduras Las levaduras son miembros de un grupo superior de microorganismos llamados hongos. Son organismos unicelulares de forma esférica, elíptica o cilíndrica. Su tamaño varía mucho, pero generalmente son más grandes que las células bacterianas.
Answer:
Si habla de quitina está haciendo referencia a los hongos y por lo tanto la respuesta son las Levaduras ya que son una especie de hongos unicelulares.
Related Questions
What do mitochondria do in healthy cells, and ny had defective mitochondria caused
David to lose his vision?
Answers
Muscle weakness, intolerance to exercise, decreased hearing and vision, ataxia, seizures, learning difficulties, heart problems, diabetes, and poor growth are the hallmark signs of mitochondrial myopathy.
What will happen if have a defective mitochondria?Defects in mitochondria, the body's energy producers that may be found inside practically all cells, are the root cause of mitochondrial disorders. mitochondrial myopathies are mitochondrial diseases that create noticeable muscular issues, while mitochondrial encephalomyopathies are mitochondrial disorders that cause noticeable muscular and neurological abnormalities.Several of the syndromes linked to mitochondrial disease include Barth syndrome, Chronic progressive external ophthalmoplegia, Kearns-Sayre syndrome, Leigh syndrome, Mitochondrial DNA depletion syndromes , Mitochondrial encephalomyopathy, Lactic acidosis, and stroke-like episodes, Mitochondrial neurogastrointestinal encephalomyopathy, Myoclonus epilepsy with ragged red fibers, Neuropathy, ataxia, and retinitis pigmentosa , Pearson syndrome.The mtDNA mutation that causes NARP also causes MILS, and the two disorders can coexist in the same family. NARP can cause developmental delay, seizures, and dementia in addition to the primary symptoms for which it is called.To learn more about mitochondria refer :
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which nutritional classification would you predict to fit most of a human pathogen? © chemolithoautotrophs © chemoorganoheterotrophs © chemolithohetertrophs © photolithoautatrophs
Answers
The nutritional classification that would fit most of a human pathogen is chemoorganoheterotrophs.
Pathogens are living organisms that can cause harm to human beings and other living organisms. The pathogen classification includes a wide range of bacteria, viruses, fungi, and parasites. Pathogens are classified based on their host range, mode of transmission, and virulence. They require nutrients and energy for their growth, and they obtain these from their environment.
The three main types of nutrition in pathogens are photoautotrophic, chemoautotrophic, and chemoheterotrophic.
Photolithoautotrophs are able to utilize sunlight for energy and minerals as their source of nutrients. They are found in extreme environments like hot springs and deep-sea vents, but not in human pathogens.
Chemolithoautotrophs are able to utilize inorganic chemicals as their source of energy and carbon dioxide as their source of carbon. They are mostly found in soil and water, but not in human pathogens.
Chemoorganoheterotrophs are able to utilize organic chemicals as their source of energy and carbon. They obtain their nutrition from the host cells and host tissue of their infected host. These organisms have metabolic pathways that help them to break down complex molecules, and they use these molecules to create ATP. This group is the most common type of pathogens that cause disease in human beings.
Hence, the correct answer is chemoorganoheterotrophs.
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Help multiple choice
Answers
Left: meiosis
Right: cloning
Which of the following distinguishes Khorapithecus from Sivapithecus?
A)Khorapithecus's molars are more similar to those of living chimpanzees than Sivapithecus's molars are.
B)Whereas Khorapithecus lived in the area now known as France and Spain,Sivapithecus lived in Thailand.
C)Khoratpithecus's broad front teeth and a flat surface on the tongue side of the canines make it more similar than Sivapithecus to living orangutans.
D)Sivapithecus has dental features making it more similar to modern orangutans,while Khorapithecus has postcranial bones that most closely resemble modern chimpanzees.
Answers
The main difference between Khorapithecus and Sivapithecus is their molars. The molars of Khorapithecus are more similar to those of living chimpanzees than Sivapithecus's molars are.
Correct option is A.
In addition, Khoratpithecus's broad front teeth and a flat surface on the tongue side of the canines make it more similar than Sivapithecus to living orangutans. On the other hand, Sivapithecus has dental features making it more similar to modern orangutans. Khorapithecus lived in the area now known as France and Spain, while Sivapithecus lived in Thailand.
Finally, Sivapithecus has postcranial bones that most closely resemble modern chimpanzees, while Khorapithecus does not. In conclusion, the main difference between Khorapithecus and Sivapithecus is their molars and dental features, and the area in which they lived.
Correct option is A.
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generally, how do sensory neurons encode stimulus intensity of higher and lower intensity? what is the dynamic range of a sensory neuron? what defines the threshold intensity of a neuron? how does range fractionation improve the dynamic range? what is the difference between population coding and place coding
Answers
Sensory neurons encode stimulus intensity of higher and lower intensity by increasing firing rate and by recruitment of additional sensory neurons.
Sensory neurons encode stimulus intensity in different ways depending on the modality. However, in general, sensory neurons can encode stimulus intensity of higher and lower intensity through the following mechanisms:
Increased firing rate: As the intensity of a stimulus increases, sensory neurons can increase their firing rate. Higher intensity stimuli lead to more frequent action potentials in the sensory neuron, resulting in a higher overall firing rate.Recruitment of additional sensory neurons: For higher intensity stimuli, sensory systems can recruit additional sensory neurons to respond to the stimulus. This increases the overall population response and enhances the encoding of stimulus intensity.The dynamic range of a sensory neuron refers to the range of stimulus intensities that the neuron can detect and respond to. It encompasses the minimum stimulus intensity that can activate the neuron and the maximum stimulus intensity that can be detected before the neuron reaches saturation.
The threshold intensity of a neuron is the minimum stimulus intensity required to elicit a response from the neuron. It represents the point at which the sensory neuron becomes activated and starts to transmit signals.
Range fractionation is a mechanism that improves the dynamic range of sensory neurons. It involves distributing the sensory neurons across a range of threshold sensitivities. By having sensory neurons with different threshold sensitivities, the population as a whole can effectively encode a wide range of stimulus intensities. Each sensory neuron within the population is specialized to respond optimally within a particular range of stimulus intensities, thereby expanding the dynamic range of the overall sensory system.
Population coding and place coding are two different strategies used by sensory systems to encode stimulus information:
Population coding: In population coding, information about a stimulus is encoded by the combined activity of a population of neurons. Each neuron within the population contributes to the overall representation of the stimulus. The pattern of activity across the population of neurons provides information about the stimulus attributes, such as its intensity or location. The relative activity levels and firing rates of different neurons within the population contribute to the encoding of specific stimulus features.
Place coding: Place coding, also known as labeled-line coding, involves the encoding of stimulus information based on the specific location or identity of the activated sensory neurons. Each sensory neuron is tuned to respond to a specific feature or modality of the stimulus. The specific neuron or group of neurons that is activated provides information about the identity or location of the stimulus. For example, in the auditory system, different neurons respond selectively to specific sound frequencies, allowing for the encoding of different frequencies or pitches.
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The adaptations of a pelican include its long, pouch-like beak. Why is the beak of the pelican an example of an adaptation?
A.
The beak is a unique feature that is found only in pelicans.
B.
All birds have beaks, but the beaks vary among different species.
C.
The shape and structure of the beak have remained the same over many generations.
D.
The shape and structure of the beak are inherited and help the pelican survive in its environment
Answers
Answer:
D. The shape and structure of the beak are inherited and help the pelican survive in its environment
Explanation:
Hope this helps!
What is the mode of the data in the photo
Answers
Explanation:
the mode is most common number on your list for example if it was 3, 5 ,6 3, 4 ,4 ,3 the mode would be 3
(HELP WANTED AUTOMATIC BRAINLY) Which statement describes how the muscular and skeletal systems cause parts of the body to move?
A. When a muscle relaxes, it causes a bone to shorten.
B. When a bone shortens, it lengthens the muscle attached to it.
C. When a bone bends, it pushes a muscle in the opposite direction.
D. When a muscle contracts, it pulls a bone in one direction.
Answers
Answer:
C.
Explanation: Because when a bone does bend the muscles pull back so the bone doesnt dislocate.
The statement describes how the muscular and skeletal systems cause parts of the body to move is when a muscle contracts, it pulls a bone in one direction.
What is skeletal system?The skeletal system is the in charge of all the bones and skeleton of the body. The skeletal system provides structure and strength to the body and protects the soft tissues.
The muscular system and the skeletal system work together as the muscles and bones are connected with each other.
Thus, the correct option is D. When a muscle contracts, it pulls a bone in one direction.
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how does precipitation helps in formation of soil
Answers
Answer: increase the degree of weathering and therefore the extent of soil development.
Explanation:
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The question for this is: Four substances are involved in both photosynthesis and cellular respiration. They are sugars, water, oxygen, and carbon dioxide. Energy is also transformed from one type to another. Describe what happens to these four substances, light energy, and chemical energy during photosynthesis. Then write a simple equation for the substances and another for energy, using words and arrows to illustrate these changes.
My friends answer is:
Photosynthesis is the process by which plants use light energy to convert water and carbon dioxide into sugars and oxygen. During photosynthesis, light energy is absorbed by the plant and converted into chemical energy. The water and carbon dioxide are broken down into their component parts, and the oxygen is released into the atmosphere. The sugars are stored in the plant for later use. The equation for photosynthesis can be represented as light energy + water + carbon dioxide → sugars + oxygen. The equation for energy transformation can be represented as light energy → chemical energy.
D u m b it down to make it look like an 8th grader wrote it pls and thank u
Answers
Plants employ the process of photosynthesis to transform water and carbon dioxide into carbohydrates and oxygen.
Light energy is absorbed by the plant during photosynthesis and transformed into chemical energy. The oxygen is released into the environment, while the water and carbon dioxide are disintegrated into their component elements.
In the plant, the sugars are kept for future use. It is possible to write the photosynthesis equation as follows:
Light energy + water + carbon dioxide → sugars + oxygen.
Light energy → chemical energy can be used to describe the energy transformation equation.
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The electron transport chain is a series of chemical reactions in which energy is transferred to form a large number of ATP molecules via the passing of _____________.
Answers
The electron transport chain is a series of chemical reactions in which energy is transferred to form a large number of ATP molecules via the passing of electrons.
What is the full form of ETC ?It stands for electron transport chain.
The ETC stands for "electron transport chain." It is a series of protein complexes located in the inner mitochondrial membrane that play a critical role in aerobic cellular respiration.
During this process, electrons are passed through the protein complexes of the ETC, releasing energy that is used to pump protons across the inner mitochondrial membrane.
Therefore, proton gradient drives the production of ATP via the enzyme ATP synthase, which converts ADP to ATP. In essence, the ETC is responsible for generating most of the ATP that is produced during aerobic respiration, making it a critical component of cellular metabolism.
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Explain the process that links the physical sensory world and
the brain for each of the senses (vision, hearing, taste, smell,
and touch).
Answers
The process that links the physical sensory world and the brain for each of the senses (vision, hearing, taste, smell, and touch) is known as transduction.
Here's how transduction works for each of the senses:
1. Vision: The eye transduces light energy into neural impulses, which are then transmitted to the brain via the optic nerve.
2. Hearing: The ear transduces sound waves into neural impulses, which are then transmitted to the brain via the auditory nerve.
3. Taste: Taste buds on the tongue transduce chemical signals from food into neural impulses, which are then transmitted to the brain via the gustatory nerve.
4. Smell: Olfactory receptor cells in the nose transduce chemical signals from odors into neural impulses, which are then transmitted to the brain via the olfactory nerve.
5. Touch: Sensory receptors in the skin transduce physical pressure, temperature, and pain into neural impulses, which are then transmitted to the brain via various sensory nerves.
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What type of scientist would be the best qualified to perform genetic engineering to pro- duce seed that are more productive in agriculture? A. biochemist B. geologist C. molecular biologist D. paleontologist
Answers
The type of scientist best qualified to perform genetic engineering to produce more productive seeds in agriculture would be a molecular biologist, the correct option is C.
Molecular biologists specialize in studying the structure, function, and interactions of molecules within biological systems, including DNA and genes. Genetic engineering involves manipulating the genetic material of organisms, which requires a deep understanding of molecular biology principles.
Molecular biologists have the expertise to identify and isolate specific genes responsible for desired traits in crop plants, such as increased productivity or resistance to pests or diseases. They can then modify or introduce these genes into target plants to achieve the desired outcomes, the correct option is C.
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What difference do you notice compared to the other the church bio molecules in nucleus acid ?
Answers
The most crucial macromolecules for maintaining life are nucleic acids. They contain instructions for a cell's proper operation as well as the genetic code for that cell.
Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA) are the two primary forms of nucleic acids. All living things, from single-celled bacteria to multicellular mammals, have DNA as their genetic makeup. It is located in the organelle, chloroplasts, and mitochondria as well as the nuclei of eukaryotes. Prokaryotes lack a membranous sheath around their DNA. A cell's genome is its entire genetic makeup, and genomics is the study of genomes. DNA and histone proteins combine to form a complex to create chromatin, the material that makes up eukaryotic chromosomes, in eukaryotic cells yet not in prokaryotes. There may be hundreds or thousands of genes on a chromosome. Many genes encode for the production of protein molecules, while some genes produce RNA. DNA manipulates the genes to turn on or turn off various biological processes.
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Which of the following is/are the best example(s) of acclimatization to light variation?
a. Plants in different climates have different forms of the same photosynthetic enzymes according to which form operates best in the plant's particular environment.
b. Spearhead plants grown in different light environments can vary the number of chloroplasts available for light harvest.
c. Lichens in the arctic can photosynthesize at temperatures close to freezing, which are prohibitive to other plants.
d. Both a and c
Answers
The spearhead plants which are grown in different types of light environments can differ in the number of chloroplasts which are available for the light harvest and this an example of acclimatization which occurs due to light.
Acclimatization can basically be defined as the process in which a certain individual organism happens to adjust to any kind of change in its environment which allows it to be able to maintain fitness across a wide range of environmental conditions. Acclimatization basically occurs during a small period of time, and occurs within the organism's lifetime.
Acclimatization can occur in response to light and spearhead are perfect examples for that in which the number of chloroplasts vary for light harvest due to different light conditions.
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Identify one food chain in this ecosystem.
Answers
Answer:
Sun -> Grass -> Beetle -> Blue Jay
Sun, Grass, Worms, Woodpecker
What does an atom share when it bonds with another atom?
A. Ions
B. protons
C. neutrons
D. electrons
Answers
what structural features of alveoli make them an ideal place for gas exchange
Answers
The structural features of alveoli make them an ideal place for gas exchange due to their large surface area and thin walls.
Alveoli are tiny, balloon-like structures found in the lungs. They are surrounded by an extensive network of capillaries, where the exchange of gases takes place. The large number of alveoli in the lungs provides a significantly large surface area for gas exchange to occur. This increased surface area allows for a greater amount of oxygen to diffuse into the bloodstream and carbon dioxide to be removed efficiently. Furthermore, the walls of the alveoli are extremely thin, consisting of a single layer of epithelial cells. This thinness enables gases to diffuse quickly across the alveolar membrane. The close proximity of the alveolar walls to the capillaries allows for a short diffusion distance, ensuring a rapid exchange of gases. Overall, the combination of the large surface area and thin walls of alveoli maximizes the efficiency of gas exchange in the lungs, facilitating the uptake of oxygen and the removal of carbon dioxide from the bloodstream. This ensures an adequate oxygen supply for cellular respiration and the elimination of waste gases produced by metabolic processes.
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how are the new strands of DNA lengthened
Answers
Explanation:
New strands of DNA are lengthened by adding new nucleotides at the replication fork.
These methods primarily involve DNA synthesis techniques, such as polymerase chain reaction (PCR) and DNA sequencing methods. However, it's important to note that scientific advancements may have occurred since my knowledge cutoff, and there could be new techniques or technologies available.
PCR is a widely used technique that allows for the amplification of specific DNA sequences. It involves a series of heating and cooling cycles, which enable the DNA to denature (separate into single strands) and then be replicated using a DNA polymerase enzyme. By repeating this process, multiple copies of the DNA sequence of interest can be generated.
DNA synthesis involves the chemical synthesis of custom DNA sequences in the laboratory. This process typically employs a method called phosphoramidite chemistry. It starts with a DNA template strand and adds nucleotides one by one, using chemical reactions to build the new DNA strand. This method allows for the controlled synthesis of long DNA strands with specific sequences.
Modern DNA sequencing technologies, such as next-generation sequencing (NGS), can indirectly contribute to DNA lengthening. During the sequencing process, DNA strands are often amplified and replicated to generate sufficient material for analysis. This amplification step can result in the lengthening of DNA strands.
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What is definition of gamete in biology?
Answers
A gamete is a reproductive cell that combines with another gamete during fertilisation (conception) in organisms that reproduce sexually.
The reproductive cells of an organism are called gametes, and they hold half of the genetic material needed to make a new person.
Male and female gametes in humans are represented by sperm and egg cells, respectively. A new person with a distinct genetic make-up is created during fertilisation when the male and female gametes mix.
Being haploid cells with only one pair of chromosomes, gametes are. The 23 chromosomes in humans make up half of the 46 chromosomes found in somatic (body) cells.
Meiosis, which decreases the number of chromosomes by half, is the procedure used to create gametes. This is crucial for maintaining genetic diversity and avoiding the inheritance of an excessive number of recessive genes by offspring.
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Which mode of inheritance results in the phenotype of a heterozygote being indistinguishable from that of an organism homozygous for the dominant allele?.
Answers
Answer: This is complete dominance.
Remember:
Density = Mass Volume
Volume = Length x Width x Height (mL is also a measure of volume)
a Density of a wood cube with 3 cm per side that has a mass of 81 grams
b. Density of a lead cube with 5 cm per side that has a mass of 400 grams
a Density of Liquid A that has a volume of 100 mL and a mass of 200 grams
Density of a
Density of b
Density of c
Answers
Answer:
A. 3g/cm³
B. 3.2g/cm³
C. 2g/cm³
Explanation:
A. Density = mass ÷ volume
Volume = length × width × height
Where;
Mass = 81grams, length = 3cm
Volume= 3cm × 3cm × 3cm = 27cm³
Density = 81/27
Density = 3g/cm³
B) Volume = length × width × height
Where;
Mass = 400grams, length = 5cm
Volume= 5cm × 5cm × 5cm = 125cm³
Density = 400/125
Density = 3.2g/cm³
C) Volume = 100mL
Where;
Mass = 200grams
Density = 200/100
Density = 2g/cm³
Which process is represetned by the arrow in the diagram?
Energy Available
for Use by
Living Organisms
Energy
Stored in
Food
a)
growth
b) respiration
c) regulation
d) photosynthesis
Answers
Answer:
photosynthesis
Explanation:
photosynthesis is the process by which food is gotten from the sun
What systems can you think of? List one or two examples of things that you think might be systems
Answers
Systems can be found in various domains, such as biology, ecology, society, information, and the physical world. Examples include the nervous system, ecosystems, economic systems, computer networks, and the solar system. Systems consist of interconnected elements working together to fulfill a common purpose.
Systems are structures or sets of interconnected elements that work together to achieve a common purpose. There are various types of systems found in different domains. Here are a few examples:
1. Biological Systems:
- The nervous system: It includes the brain, spinal cord, and nerves, which work together to transmit signals and coordinate bodily functions.
- The cardiovascular system: It consists of the heart, blood vessels, and blood, responsible for circulating oxygen, nutrients, and hormones throughout the body.
2. Ecological Systems:
- Ecosystems: A complex system comprising living organisms (plants, animals, microorganisms) interacting with their physical environment (soil, water, climate) in a specific geographical area.
- Food webs: Systems that depict the interconnectedness of various organisms in an ecosystem through their feeding relationships.
3. Social Systems:
- Economic system: A network of individuals, organizations, and institutions involved in the production, distribution, and consumption of goods and services within a society.
- Political system: Structures and processes through which a society governs itself, including institutions, laws, and decision-making mechanisms.
4. Information Systems:
- Computer networks: Interconnected devices and communication protocols that enable the exchange of data and information between computers.
- Database systems: Organized collections of data and software designed to efficiently store, retrieve, and manage large amounts of information.
5. Physical Systems:
- Solar system: A system consisting of the sun, planets, and other celestial bodies held together by gravitational forces.
- Climate system: The interactions between the atmosphere, hydrosphere, biosphere, and geosphere that influence long-term weather patterns and climate conditions.
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what is the dependent variable in the video set
Answers
Answer:
caffeine would be the dependent variable because it is feeding off of the control onion
The explanation "Only the organisms that are the best suited to survive in their environment will reproduce and pass their traits, while other organisms that are not fit will not be able to reproduce" best matches with which main principle of natural selection?AdaptationOverproductionDecent with modificationSurvival of the fittest
Answers
The term that best matches the principle of natural selection is the final one, "survival of the fittest", which states that only those organisms with the best fitness (characteristics that allow organisms to successfully survive and reproduce) will pass their genes to the future generations.
A biological theory, like the theory of evolution, that is widely accepted and supported by so many observations and experiments may be referred to as a principle or a:_________
Answers
A biological theory, like the theory of evolution, that is widely accepted and supported by so many observations and experiments may be referred to as a principle or a law.
What is a Law?This refers to statements which describes or predict a range of natural phenomena as a result of repeated experiments which has been performed and the authenticity has been prove by peers and other individuals.
A law is also referred to as principle and has been observed to be always true unlike due to the repeated scientific methods being done approving of its validity thereby making law the correct choice.
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One of the enzymatic results of the pyruvate oxidation stage of cellular respiration is the reduction of _____ to _____.
Answers
One of the enzymatic results of the pyruvate oxidation stage of cellular respiration is the reduction of NAD+ to NADH.
Cellular Respiration- The process through which organisms utilize oxygen to breakdown food molecules in order to obtain chemical energy for cellular processes is known as cellular respiration. The cells including animals, plants, the fungi, as well as those of algae and other protists, all engage in cellular respiration.
Enzyme- A biological catalyst called an enzyme is usually always a protein. It accelerates a certain chemical reaction inside the cell. The enzyme is continuously employed throughout the reaction and isn't destroyed.
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What is a isotonic solution? How does it affect a red blood cell?
What is a hypertonic solution? How does it affect a red blood cell?
What is a hypotonic solution? How does it affect a red blood cell?
Answer plz!
Answers
Answer: If you place an animal or a plant cell in a hypertonic solution, the cell shrinks
Explanation: because it loses water ( water moves from a higher concentration inside the cell to a lower concentration outside ). ... A single animal cell ( like a red blood cell) placed in a hypotonic solution will fill up with water and then burst.
An isotonic solution is one wherein the solute concentration across the semipermeable membrane is the same resulting in an equilibrium state.
They do not shrink or swell in an isotonic saline solution, i.e., 0.9% w/v solution of sodium chloride
Hypertonic solution: A solution that contains more dissolved particles (such as salt and other electrolytes) than is found in normal cells and blood.
Now, let’s suppose RBCs are placed in a solution with a sodium chloride concentration of 2% w/v. The sodium chloride concentration of 2% w/v is greater than the RBC’s sodium content and hence the solution is hypertonic. This will result in shrinkage of the RBCs known as crenation
When a solution has a lower solute concentration than the solution present across the semipermeable membrane, it is known as a hypotonic solution. As a result, when a cell is placed in a hypotonic solution, an osmotic pressure gradient forces the solvent to move into the cell in order to attain equal solute
In another situation, let’s suppose RBCs are placed in a solution with a sodium chloride concentration of 0.1 % w/v. The sodium chloride concentration of 0.1% w/v is less than the RBC’s sodium content and hence hypotonic saline. This will result in swelling and eventually bursting of the RBCs which will result in the release of hemoglobin. This is known as hemolysis which is a very dangerous situation.
7. Many athletes who are in good condition have heartbeat rates that are substantially slower than the 60 to 80 beats per minute (bpm) considered normal for the rest of us. Former cyclist Lance Armstrong routinely had a resting heart rate of about 32 bpm. For a non-athlete, a heartbeat rate this low might be cause for hospitalization, but the rate of blood flow in an athlete's body is not affected by it. How can an athlete's body function normally with such a low heartbeat rate? A. People who are athletes are born with slow heart rates so it is normal for them. B. Exercise strengthens the athlete's heart muscle so more blood is pumped with each beat. C. An athlete's heart rate is higher than normal while exercising so it averages out to normal. D. More capillaries appear in muscle tissue with exercise so blood flow is more efficient O * S
Answers
Exercise strengthens the athlete's heart muscle so more blood is pumped with each beat. The correct answer is B.
Athletes who train regularly and are in good physical condition have larger, stronger hearts than non-athletes. This allows their hearts to pump more blood with each beat, which means that their hearts don't have to beat as frequently to maintain a normal rate of blood flow. Additionally, athletes often have more efficient circulatory systems, with more capillaries in their muscles, allowing for more oxygen to be delivered to the tissues. These adaptations allow athletes to maintain a normal rate of blood flow even with a slower resting heart rate. While an athlete's heart rate may be higher than normal during exercise, their resting heart rate can be significantly lower due to the adaptations that come with training and physical conditioning.
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