Why is caffeine used for heart rate experiments

Answers

Answer 1
Physiologically, caffeine mimics the effects of epinephrine, a sympathetic nervous system stimulant, which leads to an increased heart rate and respiration rate (Mahmud et al., 2001).

Related Questions

i searched up tim and moby fan art. my eyes did not like what i saw.

Answers

Answer:

do tell, what did you see?

Your airways are coated with a thin layer of liquid called ASL and a mucus gel layer, both which neutralize foreign particles to prevent infection. In people with
Cystic Fibrosis, a gene has an error, which causes the cells of the airways (lungs, etc) to have defective plasma membranes The ASL and mucus are much
thicker than usual near the defective cells, causing a lot of lung congestion because the defective cells allow too much salt into the cells Why would allowing too much salt into the cells create thicker ASL and mucus?

À. The increased salt in the cells makes the person thirsty, leading to thickened ASL and mucus in the lungs

B. The increased salt in the cells causes water from the airways to move into the cells by osmosis, thickening the ASL and mucus in the lungs.

C. The increased salt in the cells causes water from the cells to move into the airways, thickening the ASL and mucus in the lungs

D. The increased salt in the cells is absorbed by the cytoplasm of the cell causing water to leave the cells and enter the lungs,

Answers

Answer:

d

Explanation:

There are several ways to produce the amino acids that build a protein. What does this mean?

Answers

Answer: Some MRNA codons code for multiple amino acids. So they can produce amino acids many ways, that build a protein.

There are several ways to produce the amino acids that build a protein because the genetic code is DEGENERATE or REDUNDANT.

In a given messenger RNA (mRNA) sequence, the triplets of nucleotides or 'codons' indicate specific amino acids to be added during protein synthesis.

The genetic code is said to be 'degenerate' or 'redundant' because different codons may encode the same amino acid.

For example, both the AUC codon and AUA codon in mRNA specify isoleucine, so alterations (i.e., mutations) in the nucleotide sequence do not always alter the protein sequence.

In conclusion, there are several ways to produce the amino acids that build a protein because the genetic code is DEGENERATE or REDUNDANT.

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Succession occurs after ecosystems experience some type of disruptive event. Please select the best answer from the choices provided T F

Answers

Answer:

TRUE

Explanation:

Succession occurs after ecosystems experience some type of disruptive event.

Answer:

TRUE

Explanation:

Edge 2020

Why are bacteria such as Rhizobium and cyanobacteria so important in the
nitrogen cycle?
A. They return nitrogen gas to air
B. They fix atmospheric nitrogen gas for the food chain
C. They decompose dead plants and animals
D. They build protein in plants

Answers

Answer:A. They return nitrogen gas to air

Explanation:

Answer:

The correct answer is B

Explanation:

Got it correct on GAVS..

PLEASE HELP WILL GIVE CROWN

Answers

Answer:

C E A  hope it helps

Explanation:

C e and a I’m pretty sure make sure to tell me if I’m right or wrong

Which event occurred during the Space Race?


NASA was established.
The International Space Station was built.
The Soviet Union launched Salyut.
The United States launched Skylab.

Answers

Answer:

The International Space Station was built.

Explanation:

Answer:

A.) NASA was established.

which one of the following is not an organic compound​

Answers

CaO i think, hoped that helped

The few carbon-containing compounds not classified as organic include carbides, carbonates, and cyanides.

what are the importance of planting and propagating trees and fruit bearing trees?​

Answers

Answer:

Planting and propagating trees and fruit bearing trees are important because without these we won't have fruits to eat, our land will suffer from soil erosion, there will be landslide and flooding and we won't have fresh air to breathe.

Planting and propagating trees and fruit-bearing trees is important in a variety of ways:

Many fruits from trees serve as food for other organisms, including man. Fruits are rich in important nutrients that are essential for the health and survival of man.Trees are sources of timber for various construction works for man. Trees serve as habitats for other living organisms like insects, birds, etc. These organisms serve important ecological functions in the ecosystem.Trees are important for tackling water erosion. The roots of trees hold the soil structures together while their leaves reduce the force with which raindrops hit the ground.Trees help with carbon fixation. Thus, they help rid the environment of pollution and purify the air.Branches of trees also act as breakages during wind, thus, protecting the environment.

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Which of the following elements is required for growth and development and is in our DNA? *
hydrogen
carbon
oxygen
nitrogen
phosphorus

Answers

Answer:

Nitrogen

Explanation:

Nitrogen is the most abundant element in our atmosphere and 7th most abundant in the universe.  It is vital in the formation of nitrogenous bases which are the key bonds that form nucleic acids such RNA and DNA.

Beth recently became a vegetarian. The doctor suggested beth eats more peas and beans to ensure she gets all of the nutrients she needs. what element might the doctor be trying to give her more of

Answers

Answer:

nitrogen

Explanation:

Answer:

Nitrogen!

Explanation:

I took the test!!!

The leaves of chaparral shrubs are typically __________.
A)
small and waxy
B)
evergreen leaves
C)
able to store water
D)
all of the above


Please select the best answer from the choices provided

A
B
C
D

Answers

Answer:

D. All of the above

Explanation:

Answer:

D

Explanation:

Name three similarities between Mitosis and Binary fission.
1.
2.
3.

Answers

The similarity they have is that they both produce two identical cells to each other and to the mother cell, but the mechanism is totally different as binary fission takes place in prokaryotic cells while mitosis takes place in eukaryotic ones.


Primary function is reproduction. High fidelity replication in which chromosome number is maintained through a checkpoint at metaphase. Errors occur, but more rarely than in fission.

Uses cytokinesis to divide cytoplasm.




Varicella-zoster is the virus that causes chickenpox. The average incubation period is 14 to 16 days after exposure. A person usually experiences a mild fever and fatigue for 1 to 2 days before rashes appear all over the body. A person having had chickenpox as a child may have the virus lay inactive in the nerve cells for many years only to reactivate much later as an adult in the form of shingles, which results in a very painful rash. This information suggests that the reproductive cycle of the varicella virus is -
a)lytic for shingles because the virus causes rashes to appear on the skin.

b) lysogenic for chickenpox because the virus attacks the mucous membranes.

c) lysogenic because the virus is a varicella-zoster virus.

d) lytic for chickenpox because the symptoms appear soon after infection.

Answers

Answer:d

Explanation: because it’s true

Carbohydrate, Protein, and Fat Digestive Enzymes A key objective in this chapter is to identify the major enzymes in the digestion of carbohydrates, proteins, and fats as well as the organs that secrete them. This activity requires you to match the enzyme with the secreting organ. Drag the names of the enzymes to their respective bins, representing the appropriate secreting organ. Some organs secrete more than one enzyme. 1. pancreatic amylase2. pepsin3. salvary amylase4. gastnc lipase 5. pancreatic lipase6. trypsin 7. chymotrypsin8. carboxypeptidaseA. Salivary Glands B. Stomach C. Pancreas D. Small Intestine

Answers

Answer:

its C

Explanation:

The following enzymes are secreted by the organs listed below:

Salivary glands: salivary amylaseStomach: pepsinPancreas: pancreatic amylase, pancreatic lipase, trypsin, chymotrypsin, carboxypeptidaseSmall intestine: pancreatic lipase, trypsin, chymotrypsin, carboxypeptidase

Salivary amylase enzyme is secreted by the salivary glands and breaks down starch into maltose. Pepsin enzyme is secreted by the stomach and breaks down proteins into smaller polypeptides. Pancreatic amylase enzyme is secreted by the pancreas and breaks down starch into maltose. Gastric lipase enzyme is secreted by the stomach and breaks down fats into fatty acids and glycerol.

Pancreatic lipase enzyme is secreted by the pancreas and breaks down fats into fatty acids and glycerol. Trypsin enzyme is secreted by the pancreas and breaks down polypeptides into smaller polypeptides. Chymotrypsin enzyme is secreted by the pancreas and breaks down polypeptides into smaller polypeptides. Carboxypeptidase enzyme is secreted by the pancreas and breaks down polypeptides into amino acids.

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59:33
Which best describes thermal energy?
It is the difference between internal energies of two or more substances.
It is the sum of internal energies of two or more substances.
It is the portion of internal energy that can be transferred from one substance to another.
It is the portion of potential energy that can be transferred from one substance to another

Answers

Answer: The correct answer is (B.-It is the sum of internal energies of two or more substances.)

How are the molecules in photosynthesis and cellular respiration similar?

Answers

The two processes are similar in that they both produce energy, albeit in two different forms. They are different in that photosynthesis assembles the glucose molecule, while cellular respiration takes it apart

PLEASE HELP ME
What roles do photosynthesis and respiration play in
the distribution of gases in seawater?

Answers

Photosynthesis involves the use of energy from sunlight, water and carbon dioxide to produce glucose and oxygen. Cellular respiration uses glucose and oxygen to produce carbon dioxide and water. ... For example, both processes synthesize and use ATP, the energy currency.
2.) Seawater has many different gases dissolved in it, especially nitrogen, oxygen and carbon dioxide. It exchanges these gases with the atmosphere to keep a balance between the ocean and the atmosphere. This exchange is helped by the mixing of the surface by wind and waves. :)))

Choose all the answers that apply.

The troposphere is _____.

1. the warmest layer
2. responsible for weather and clouds
3. the coldest layer
4. warmed by the Earth's surface
5. the lowest layer

You can choose multiple answers

Answers

Answer:

The troposphere is the lowest layer

Explanation:

hope this helps!! there could be more that are right I'm just not sure so

Answer:

The answer is 2.responsible for weather and clouds

Explanation:

1. ____________ takes place in organelles called chloroplasts.

2. Light energy is captured by the green pigment ____________

3. Cells use oxygen to release energy during ___________​

Answers

Answer: Photosynthesis

Explanation:

Answer:

Explanation:

Cells get nutrients from their environment, but where do those nutrients come from? Virtually all organic material on Earth has been produced by cells that convert energy from the Sun into energy-containing macromolecules. This process, called photosynthesis, is essential to the global carbon cycle and organisms that conduct photosynthesis represent the lowest level in most food chains (Figure 1).  

Consider the impact of each substance on cellular respiration. Each substance has an influence at the cellular level, and has no effect on hunger. Assume that the substances have no other impact on the cell other than the one described. Substance’s Effect: Makes the lipid bilayer of the inner mitochondrial membrane highly permeable to (H+) protons. Does it cause weight gain or loss?

Answers

Answer:

The correct answer is "Weight loss".

Explanation:

If the influence of material is such that it adversely affects the attachment of NAD+ to electrodes, it can help people lose weight. This because it will indeed necessarily imply that perhaps the ATP throughout the cells would've been whittled down unless the compound NADH could not have been established. This also suggests that because the body doesn't obtain adequate ATP, this also contributes to the breakdown of fat into some kind of type of stored energy which always promotes weight loss throughout the turn.

brainscape: Restriction enzymes: A) act at the membrane to restrict the passage of certain molecules into the cell. B) are highly specialized ribonucleases that degrade mRNA soon after its synthesis. C) are sequence-specific DNA endonucleases. D) are very specific proteases that cleave peptides at only certain sequences. E) catalyze the addition of a certain amino acid to a specific tRNA. c The biological role of restriction enzymes is to: A) aid recombinant DNA research. B) degrade foreign DNA that enters a bacterium. C) make bacteria resistant to antibiotics. D) restrict the damage to DNA by ultraviolet light. E) restrict the size of DNA in certain bacteria.

Answers

Answer:

C) are sequence-specific DNA endonucleases

B) degrade foreign DNA that enters a bacterium.

Explanation:

Restriction enzymes are the proteins that cut the DNA at a specific sequence.

Restriction enzymes are also known as restriction endonuclease produced by bacteria that recognizes a specific sequence on DNA and split it by catalyzing the hydrolysis or addition of water molecule. So, Restriction enzymes are sequence-specific DNA endonucleases.

The biological role of restriction enzymes is to restrict the entry of foreign DNA into the bacterium. Restriction enzymes have the ability to restrict the number of bacteriophage strains that affect bacteria.

Hence, the correct options are "C and B"

The area where an ocean meets land is called the ____ zone.

aphotic
photic
intertidal
benthic

Answers

Answer:

the area where ocean meets land is called the intertidal zone

The area where an ocean meets land is called the "intertidal" zone. Therefore, option (C) is correct.

What is intertidal zone?

The intertidal zone, also known as the littoral zone, is the area of the shoreline that is exposed to air at low tide and submerged underwater at high tide. This zone is the boundary between the land and sea and is constantly affected by the ebb and flow of the tides. The intertidal zone is characterized by its unique physical and environmental conditions, such as the exposure to air and sunlight, the fluctuations in temperature and salinity, and the constant pounding of waves.

Due to these environmental conditions, the intertidal zone is home to a diverse range of plant and animal species that have adapted to the harsh and dynamic environment, such as barnacles, mussels, crabs, and seaweed. The intertidal zone is an important ecosystem that provides habitat, food, and breeding grounds for many marine species, and is also a popular area for recreation and scientific research.

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Need help noooooo caaappppp

Answers

Answer:

ok what is your questions and technical discussion and answers from the medulla up to the whole length of the vertebral column any less than the average salary is a great day out, but it would like us know when to go through it all in the category, the first one of our customers with other types and the basic principles, but it would like us know when to go through it all within

Explanation:

easy reach of the following are the best way to get the best way to get the best way to get the best way to get the best way to get the best way to get the best way to get the most popular of my friends are the details

A 50-year old man notices a hard spot just superior to the diaphragm that he has never had before.
Should he be alarmed? Explain.

Answers

Answer:

Yes

Explanation:

Hes old he could die duh.

what are 15 things we get from plants?

Answers

Answer:

Fruits, vegetables, spices, cereals, Wood, Fibres, Cotton, perfumes, dyes, and most importantly medicines.

Explanation:

Plants play a major role in the preparation of several useful drugs and antibiotics.

The following statement compares different starches: Because it is branched and can be broken down to ________ by multiple enzymes at the same time, _________ is digested more quickly than _________. The following statement compares different starches: Because it is branched and can be broken down to ________ by multiple enzymes at the same time, _________ is digested more quickly than _________. lactose; amylose; amylopectin fructose; cellulose; amylopectin monosaccharides; amylopectin; amylose simple sugars; cellulose; amylose amylopectin; amylose; glycogen

Answers

Answer:

monosaccharides

amylopectin

amylose

Explanation:

Monosaccharides is any of the class of sugars such that it cannot be hydrolysed into a simpler sugar.

Amylopectin is the non-crystallizable form of starch that consists of a branch of polysaccharide chains.

Amylose is the crystallizable form of starch that consists of an unbranched polysaccharide chains

The following statement compares different starches: Because it is branched and can be broken down to monosaccharides by multiple enzymes at the same time, amylopectin is digested more quickly than amylose.

A(n) ___ lens has a center that is thicker than its edge.

Answers

Answer:

convex

Hope this helps

Which of the samples shown below are eukaryotic?

Answers

Answer:

Eukaryotic cells look like little medicine caplets.

Explanation:

I hope right the answers please Mark please brainlist

Which of the following best describes the formation of the bond shown in Figure 1 ?
А
An ionic bond is formed between a carbon atom of one amino acid and the nitrogen atom of the other amino acid,
B
An ionic bond is formed when the negative charge of an OH group is balanced by the positive charge of a hydrogen ion.
с
A covalent bond is formed between a carbon atom and a nitrogen atom along with the formation of H2O
D
A covalent bond is formed that replaces the hydrogen bond between the OH group and the H atom,

Answers

Answer: it is c, a covalent bond

Explanation:

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