How long does the cardiac cycle take?
Answers
At a normal resting heart rate of around 60 to 100 beats per minute, the cardiac cycle typically takes between 0.8 and 1.2 seconds to complete. During this time, the heart undergoes a series of mechanical and electrical events that allow it to pump blood through the circulatory system and provide oxygen and nutrients to the body's tissues.
The cardiac cycle refers to the sequence of events that occur during one complete heartbeat, which includes both the contraction (systole) and relaxation (diastole) phases of the heart muscle. The duration of the cardiac cycle can vary depending on a number of factors, including heart rate, age, and physical activity. The duration of the different phases of the cardiac cycle can also vary depending on the specific conditions of the heart, such as the presence of arrhythmias or other cardiac abnormalities.
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Related Questions
Which organisms are not examples of an adaptive radiation?A. Mammals and reptiles in the post-dinosaur ageB. Honeycreeper songbirds of the Hawaiian islandsC. Horses and deer in the post-dinosaur ageD. Anolis lizards of the Caribbean
Answers
Organisms that are not examples of an adaptive radiation are those that did not undergo rapid speciation and diversification to fill ecological niches in a relatively short period of time. Based on this definition, option A (mammals and reptiles in the post-dinosaur age) and option C (horses and deer in the post-dinosaur age) are not examples of adaptive radiations as they evolved over a longer period of time and did not experience a sudden burst of diversification.
Option B (honeycreeper songbirds of the Hawaiian islands) and option D (Anolis lizards of the Caribbean) are examples of adaptive radiations as they underwent rapid diversification to fill ecological niches in their respective island habitats.
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Compared to the extracellular fluid, cytosol contains:
A) a higher concentration of potassium ions.
B) a lower concentration of dissolved proteins.
C) almost no glycogen.
D) a higher concentration of amino acids.
E) almost no lipids
Answers
compared to extracellular fluid, Cytosol has a much lower concentration of sodium ions than the extracellular fluid and a higher concentration of potassium ions, a relatively high concentration of dissolved protein
cytosol have varieties of concentration of proteins, potassium ions, sodium ions etc.
PH of cytosol is generally between 7-7.4 and most of the cytosol have 70% of water.
cytosol also have large amounts of charged macromolecules.
The various concentration of sodium and potassium ions between cytosol and extracellular fluids ( Extracellular fluid (ECF) is what surrounds all cells in the body) is due to Na+/K ATPase pumps that facilitate the active transport of these ions
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if epigenetic changes take place above the level of the genome , what would be an example of a change at the level of the genome ?
Answers
Answer:
epigenetics chamges take place.
Epigenetics is the examination of the way cells manipulate gene interest without converting the DNA series." Epi-"approach on or above in Greek, and "epigenetic" describes elements past the genetic code.
Epigenetic changes are adjustments to DNA that modify whether or not genes are grown to become on or off. These adjustments are connected to DNA and do now no longer alternate the series of DNA constructing blocks. Within the entire set of DNA in a (genome), all the adjustments that modify the interest (expression) of the genes are referred to as the epigenome.
Because epigenetic changes assist decide whether or not genes are grown to become on or off, they affect the manufacturing of proteins in cells. This law facilitates making sure that everyone produces the handiest proteins which might be essential for its function. For example, proteins that sell bone boom aren't produced in muscle cells.
What is the epigenetic pattern?Patterns of epigenetic change range amongst individuals, in one-of-a-kind tissues inside an individual, or even in one-of-a-kind cells inside a tissue. Environmental influences, together with a person’s food plan and publicity to pollutants, can affect the epigenome. Epigenetic adjustments may be maintained from cell to as cells divide and, in a few cases.
Hence concluded that Epigenetics changes and causes cancers, by changing the genome, epigenome, or both.
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Which of the following processes involves the chloroplast?a. cell divisionb. conversion of light energy to chemical energyc. formation of reproductive cells d. stringing amino acids together
Answers
Answer:
\(\boxed{\tt B. \ Conversion\ of\ light \ energy \ to \ chemical \ energy}\)
Explanation:
This question asks us which process involves the chloroplast.
In plants, algae, and some bacteria, a process called photosynthesis occurs. This process takes place in the chloroplasts. In the process, the organism takes light energy from the sun, carbon dioxide, and water, and turns it into glucose and oxygen.
The glucose that is made becomes the food and energy for the organism. In another process, called cellular respiration, the sugar is turned into ATP, a kind of useable energy.
The best answer choice is B. Conversion of light energy to chemical energy. The chloroplasts convert light energy to sugar, and the sugar becomes chemical energy.
diffusion is the movement of a substance?
A.only through a lipid bilayer membrane
B.from an area of low concentration to an area of higher concentration
C.only in liquids
D.from an area of high concentration to an area of lower concentration
Answers
Answer:
Explanation:
Diffusion also happens for gases, so it is not C. Diffusion does not require energy, so it is not B. It cannot be A as diffusion can happen through other membranes, I think? Therefore, it is D.
In a sex linked trait, the recessive phenotype is most often found in males because...
Answers
Answer:
X-linked recessive diseases most often occur in males. Males have only one X chromosome. A single recessive gene on that X chromosome will cause the disease. The Y chromosome is the other half of the XY gene pair in the male.
Explanation:
Why are you learning this stuff anyways.Girl????????
the head of a phospolipid interacts with water because it is
Answers
Answer:
A single phospholipid molecule has a phosphate group on one end, called the “head,” and two side-by-side chains of fatty acids that make up the lipid “tails. ” The phosphate group is negatively charged, making the head polar and hydrophilic, or “water loving.” The phosphate heads are thus attracted to the water .
What is a Fungi’s response to outside is known as what
Answers
Answer:
Tendency of fungi to grow toward or away from a source of light. gravitropism. A fungi's response to gravity in which stems grow upward and roots grow downward.
Answer: phototropism.
Explanation: Fungi grows toward or away from a source of light. gravitropism. A fungi's response to gravity in which stems grow upward and roots grow downward.
Short-spined sea urchin fossils were found directly above long-spined sea urchin fossils in a layer of rock. What do the differences between the two sets of sea urchin fossils suggest about them?
Answers
The animals die, they get covered in layers. The lowest being the oldest. The difference is showing us a direct link between the two fossils. This means that the longer-spined sea urchins existed before the shorter-spined sea urchins. And evolved to have shorter spines rather than long ones.
What do you understand by the term Homology?Homology is the term that used to describe the similarities in between biological structures or the organs in 2 or more distinct organism that comes from a common ancestors.
Thus, longer-spined sea urchins existed before the shorter-spined sea urchins.
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how many glucose molecules in a polysaccharide that is hydrolzyed
Answers
Polysaccharides are macromolecules formed by joining many monosaccharides with glycosidic bonds. They are essential carbohydrates found in many types of organisms, serving as energy sources and structural components. The breakdown of these polymers requires the hydrolysis of the glycosidic bond to release the individual monosaccharides that make up the polymer.
In other words, polysaccharides can be broken down into individual glucose molecules through hydrolysis. The number of glucose molecules obtained through the hydrolysis of a polysaccharide depends on the type of polysaccharide. For example, starch, which is the primary carbohydrate storage molecule in plants, is composed of glucose molecules that are joined together in long chains. The number of glucose molecules obtained from hydrolysis of starch depends on the length of the chains and the degree of branching within the molecule. Amylose, a component of starch, is an unbranched polymer of glucose.
Therefore, hydrolysis of amylose yields several glucose molecules. Amylopectin, on the other hand, is a branched polymer of glucose, which has multiple points of attachment. This branching pattern creates a more complex structure, which requires several different enzymes to break down the molecule.
As a result, hydrolysis of amylopectin yields many more glucose molecules than amylose. A single molecule of glycogen, which is the primary carbohydrate storage molecule in animals, is a highly branched polymer of glucose. Hydrolysis of glycogen results in the release of many glucose molecules.
In conclusion, the number of glucose molecules obtained through the hydrolysis of a polysaccharide depends on its type, and it can range from several to many glucose molecules.
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I just don't know what each one is
Stimulus: Ca2+ ion levels in blood are too low
•Sensor: •Control center:
•Effector and action(s):
•Negative feedback:
•Stimulus: Ca2+ ion levels in blood are too high
•Sensor:
•Control center:
•Effector and action(s):
•Negative feedback:
Answers
around
2 Which parts of your body are most likely to fossilise best?
Answers
the harder parts of our bodies are more likely to fossilized the best. for example, bones and teeth will fossilize better than our skin or even our eyes. ^^'
I hope this helps
The screens show two sound waves
that last the same amount of time. Which wave
has a higher frequency? Explain your answer.
Answers
the wave with a higher frequency is the one that shows the shortest distance between each crest or trough, and the amount of time that a sound wave lasts does not determine its frequency.
The wave with the higher frequency is the one that shows the shorter distance between each crest or trough. The frequency of a wave is the number of oscillations it makes in one second and is measured in hertz (Hz).A wave with a higher frequency makes more oscillations in one second than a wave with a lower frequency. The amount of time that a sound wave lasts does not determine its frequency. Therefore, it's possible for two sound waves to last the same amount of time but have different frequencies.
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After photosynthesis, plants store their energy as
a)chlorophyll
b)pigment
c)glucose (sugar)
d)oxygen
Answers
Answer:
C
Explanation:
energy stored as sugar within chloroplasts -- the energy factories found in plant cells.
A cell can be part of a larger system.
True
O False
Answers
Answer:
true
Explanation:
There are millions of cells in your body. That means a cell can be part of a larger system. larger system = your body
What if the light intensity was 1000, but the only available wavelengths was 400. What do you predict would happen to the ATP production, and why?
Answers
ATP production depends only on intensity of light and not on wavelength of light.
The production of plant food, the size and color of leaves, and flowering are all impacted by light intensity. Plants that are grown in low light typically have spindly growth and leaves that are light green. Similar plants cultivated under intense lighting typically have shorter, better branches and larger, dark green leaves.
Lack of light causes the plants' leaves to yellow, their stems to weaken, and their leaves to shrink. Lack of light causes plants to eventually lose their color and perish. The growth of plants can potentially be harmed by excessive light exposure. One of the many elements influencing plant growth is light.
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how damage to nervous system in spinal cord can cause movement in arms but no movement in legs
Answers
Damage to the nervous system in the spinal cord can cause movement in arms but no movement in legs because nerves in the spinal cord are responsible for the movement of legs.
What happens to the nervous system when the spinal cord is damaged?A spinal cord injury can cause one or more symptoms involving Numbness, tingling, or a loss of or changes in impact in the hands and feet. Paralysis may happen straight away or develop over time as swelling and bleeding influence the spinal cord. Pain or pressure in the head, neck, or back.
the disease of the nervous system: Nerve damage neuropathy, spinal cord injury myelopathy, brain harm stroke, or another brain injury a lower injury to the spinal cord may cause paralysis attacks the legs and lower body.
So we can conclude that a spinal cord injury can harm a few, many, or almost all of the nerve fibers that crucifix the site of injury
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Which type of plant cell is strong but flexible?
Answers
Answer:
Sclerenchyma cells
Explanation:
Sclerenchyma cells are the strongest plant cell type.
A crocodile-like morphology evolved independently in a group of Triassic reptiles called phytosaurs, and later, after phytosaurs were extinct, in true crocodiles. This is an example of: Sympatric speciation. Iterative evolution Evolutionary drift Genetic drift Lamarckian evolution
Answers
The correct answer is iterative evolution. A crocodile-like morphology evolved independently in a group of Triassic reptiles called phytosaurs, and later, after phytosaurs were extinct, in true crocodiles. This is an example of iterative evolution.
Iterative evolution is the development of similar structures or forms independently over time in separate lineages. This is frequently seen in unrelated lineages of organisms that evolve similar features through convergent evolution. The crocodile-like morphology that evolved independently in Triassic reptiles called phytosaurs and later in true crocodiles is an example of iterative evolution as they evolved independently in separate lineages. The ability of the phytosaurs to thrive in an aquatic environment likely contributed to the development of this morphology, which later allowed true crocodiles to similarly thrive.
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which of the following is not a part of inspiration? group of answer choices the pressure in the lungs increases. the rib cage moves up and out. the diaphragm contracts and moves down. the intercostal muscles pull the ribs outward. air rushes into the lungs.
Answers
The pressure in the lungs increases is not a part of inspiration.
The process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, primarily to flush out carbon dioxide and bring in oxygen, is known as breathing (or ventilation).
The process of taking air into the lungs is known as inspiration (inhalation). Because it is the result of muscle contraction, it is the active phase of ventilation. The diaphragm contracts and the thoracic cavity expands during inspiration. This lowers the intraalveolar pressure, allowing air to enter the lungs.
Expiration (exhalation) is the process by which air is expelled from the lungs during the breathing cycle. The relaxation of the diaphragm and elastic recoil of tissue during expiration reduces thoracic volume while increasing intraalveolar pressure. Expiration forces air from the lungs.
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the theory of continental drift hypothesizes that the continents have slowly moved apart from one another after originally being a single landmass. today, monkeys can be found on in both south america and in africa. considering these continents were once connected, which of the following statements is most likely to be true: group of answer choices the separation of the continents caused a mass extinction event monkeys exhibited fewer genetic differences from one another before the continents separated modern-day monkeys are larger than those existing when the continents were connected the separation of the continents facilitated a decrease in biodiversity modern-day monkeys from each continent are reproductively compatible
Answers
Based on the theory of continental drift, it is believed that the continents were once connected as a single landmass called Pangaea, and have slowly moved apart from one another over time. Monkeys are found in both South America and Africa today, which indicates that they were present on the ancient supercontinent of Pangaea.
The separation of the continents did not cause a mass extinction event, but rather facilitated the diversification of species by creating new habitats and ecosystems. The separation of the continents could have also contributed to the formation of new species by isolating populations from each other and allowing for the accumulation of genetic differences over time.
It is unlikely that modern-day monkeys are larger than those that existed when the continents were connected since body size is subject to evolutionary pressures and can vary widely depending on the specific ecological conditions in which the species live.
As for the reproductive compatibility of modern-day monkeys from each continent, there is evidence to suggest that some species of monkeys are reproductively compatible despite being separated by millions of years of evolution. However, this is not always the case and many species have diverged too far genetically to produce viable offspring.
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Explain in your own words how volume is measured.
Answers
Answer: Volume is measured by length x width x height.
Explanation: how that helps.
V = L • W • H
V = B • H
Given the formulas, volume is measured by multiplying the length (how long something is), the width (how wide something is), and the height (how tall or high something is).
1. Choose the correct answer.
Botany is
(1)the branch of biological science that deals with plants
(2)the branch of biological science that deals with atoms
(3)the branch of biological science that deals with humans
(4)the branch of biological science that deals with animals
(5)the branch of biological science that deals with forces
Answers
Answer:
option A is the correct answer of given question the branch of biological science that deals with plants is known as botany
Answer:
Option 1
Explanation:
Botany is the branch of biological science that deals with plants.
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The table below shows the depths at which an index fossil and three other fossils were found.
Fossil Data
Fossil Depth (meters)
A 320
B 380
C 500
Index fossil 380
Which statement is correct?
The index fossil is the oldest fossil.
The index fossil is the youngest fossil.
Fossil A is the same age as the index fossil.
Fossil B is the same age as the index fossil.
Answers
Answer:
Fossil B is the same age as the index fossil.
Explanation:
TOO LATE BUSTER
Answer:
B
Explanation:
which of the following data were available to watson and crick when they were trying to determine the structure of dna? check all that apply.
Answers
X-ray crystallography is what Watson and Crick used to try to figure out the structure of DNA.
How did Watson and Crick discover DNA's structure?The discovery of DNA's molecular structure by Watson and Crick was made possible by the first X-ray photograph of DNA, which was taken in 1952. It was produced by Rosalind Franklin using an X-ray crystallography method, revealing the DNA molecule's helical structure.
What does the Watson and Crick model structurally explain?Watson-Crick DNA's physical makeup. The Watson-Crick DNA Model (1953) A double-stranded, helical molecule, DNA is composed of nucleic acids. On the outside, it has two sugar-phosphate backbones, and on the inside, nitrogenous bases are bound together by hydrogen bonds.
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We took glass jars and filled them with water. Now, Took two onion bulb and place one on each jar. a) What will be the observation in the roots of the onion after 2 to 4 days? b) What tissue is present in the tip of the root? c) Where is this tissue present other than tips of roots? d) What happens if the tips of the roots cut?
Answers
Answer:
Explanation:
a)When glass jars are filled with water and onion bulbs are placed inside, small white roots will emerge from the bottom of each onion bulb within 2 to 4 days. These roots will continue to grow longer as time passes.
b)The tissue present in the tip of the root is known as the apical meristem. This particular region is responsible for cell division and the growth and development of the root.
c)Apart from being present in the tips of roots, the apical meristem tissue can also be found in the tips of shoots in all plants. It plays a crucial role in the growth of the plant's length.
d)Cutting the tips of the roots will temporarily halt the growth of the roots as the apical meristem is removed. However, the plant will eventually develop new apical meristems and resume growing. This may affect the growth rate of the plant, and the root system may become more branched.
A DNA molecule produced by combining DNA from different sources is known as
(ONLY ANSWER IF YOU KNOW ITS RIGHT)
a mutant.
a hybrid.
a polyploid.
recombinant DNA.
Answers
Answer:
A DNA molecule produced by combining DNA from different sources is known as recombinant DNA.
Explanation:
Recombinant DNA (rDNA) can be obtained by coupling DNA fragments from different sources, a process that is performed at the restriction site level and uses enzymes.
Once rDNA has been designed —cutting out fragments of DNA that are then reassembled— it must be brought to a specific location in the cells, to be copied and expressed, using means of transport called vectors.
DNA recombination is performed in biotechnology laboratories specialized in the manipulation of genetic material.
The other options are not correct because:
Mutant or mutated DNA is a DNA molecule with an alteration of its nitrogenous base sequence Hybrid DNA is a variant of recombiant DNA, in which only two DNA molecules from different sources are used. Polyploid refers to cells containing the genome of different species.what galaxy group do we belong to?
Answers
Answer:
We belong to the Milky Way Galaxy
Explanation:
The galaxy group we belong to is the Milky Way
A clean-catch midstream urine is plated onto sheep blood agar and MacConkey with a 0.001 mL loop (1 uL). The next day a pure culture of 68 white colonies is growing on the blood agar with no growth on the MacConkey What is the colony count per milliliter of the urine
Answers
The colony count per milliliter of the urine is 68,000 CFU/mL.
To determine the colony count per milliliter of urine, we can use the number of colonies on the blood agar plate and the volume of urine plated.
Given that there are 68 white colonies on the blood agar plate, we need to calculate the dilution factor to determine the colony count.
Since a 0.001 mL (1 uL) loop was used to plate the urine, the dilution factor is the reciprocal of this volume, which is 1000.
To calculate the colony count per milliliter (CFU/mL), we multiply the number of colonies counted (68) by the dilution factor (1000).
CFU/mL = Number of colonies x Dilution factor
= 68 x 1000
= 68,000 CFU/mL
Therefore, the colony count per milliliter of the urine is 68,000 CFU/mL.
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5
How does the burning of fossil fuels negatively impact ecosystems? Select all that apply
A It increases biodiversity in tropical environments
B It creates air pollution and acid rain
с
It causes eutrophication in lakes and ponds
D
It creates nitrogen oxide gases that deplete Earth's protective ozone layer
E
It increases greenhouse gases in the atmosphere cause global climate change
FIt increases the pH of ocean water
Answers
It creates pollution and acid rain
It creates nitrogen oxide gases that deplete Earth’s protective ozone layer
It increases greenhouse gases in the atmosphere
Step By Step Explanation:
The burning of fossil fuels negatively impacts ecosystems in that it creates air pollution and acid rain, produces nitrogen oxide gases that deplete Earth's protective ozone layer, increases greenhouse gases in the atmosphere, and causes global climate change. B, D, and E are the correct options.
What is the burning of fossil fuels?The burning of fossil fuels, such as coal, oil, and gas, releases a variety of pollutants into the environment. One of the most significant impacts is the release of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere. These compounds can react with water and air to form acid rain, which can have harmful effects on both terrestrial and aquatic ecosystems.
Hence, the correct answers are It creates air pollution and acid rain, produces nitrogen oxide gases that deplete Earth's protective ozone layer, increases greenhouse gases in the atmosphere, and causes global climate change. B, D, and E are the correct options.
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