The answer is C. Acetylcholine.

Here's why:

Depolarization in the heart is the process by which the heart muscle cells are electrically stimulated to contract and pump blood. This process is regulated by the autonomic nervous system, which includes the sympathetic and parasympathetic nervous systems.

A. Norepinephrine and B. Epinephrine are both hormones and neurotransmitters that are part of the sympathetic nervous system. They are released during times of stress and act to increase heart rate and force of contraction, which would increase the rate of depolarization, not decrease it.

C. Acetylcholine, on the other hand, is a neurotransmitter in the parasympathetic nervous system. It acts to slow the heart rate and decrease the force of contraction, which would decrease the rate of depolarization.

D. As explained above, epinephrine and norepinephrine would increase, not decrease, the rate of depolarization.

E. While acetylcholine would decrease the rate of depolarization, including epinephrine and norepinephrine in this option is incorrect because they would have the opposite effect.

So, the correct answer is C. Acetylcholine.

Question

The answer is C. Acetylcholine.

Here's why:

Depolarization in the heart is the process by which the heart muscle cells are electrically stimulated to contract and pump blood. This process is regulated by the autonomic nervous system, which includes the sympathetic and parasympathetic nervous systems.

A. Norepinephrine and B. Epinephrine are both hormones and neurotransmitters that are part of the sympathetic nervous system. They are released during times of stress and act to increase heart rate and force of contraction, which would increase the rate of depolarization, not decrease it.

C. Acetylcholine, on the other hand, is a neurotransmitter in the parasympathetic nervous system. It acts to slow the heart rate and decrease the force of contraction, which would decrease the rate of depolarization.

D. As explained above, epinephrine and norepinephrine would increase, not decrease, the rate of depolarization.

E. While acetylcholine would decrease the rate of depolarization, including epinephrine and norepinephrine in this option is incorrect because they would have the opposite effect.

So, the correct answer is C. Acetylcholine.

Knowee AI · Accepted Answer

The answer is C. Acetylcholine.

Here's why:

Depolarization in the heart is the process by which the heart muscle cells are electrically stimulated to contract and pump blood. This process is regulated by the autonomic nervous system, which includes the sympathetic and parasympathetic nervous systems.

A. Norepinephrine and B. Epinephrine are both hormones and neurotransmitters that are part of the sympathetic nervous system. They are released during times of stress and act to increase heart rate and force of contraction, which would increase the rate of depolarization, not decrease it.

C. Acetylcholine, on the other hand, is a neurotransmitter in the parasympathetic nervous system. It acts to slow the heart rate and decrease the force of contraction, which would decrease the rate of depolarization.

D. As explained above, epinephrine and norepinephrine would increase, not decrease, the rate of depolarization.

E. While acetylcholine would decrease the rate of depolarization, including epinephrine and norepinephrine in this option is incorrect because they would have the opposite effect.

So, the correct answer is C. Acetylcholine.

Which of the following decreases the rate of depolarization in the heart?Question 13Select one:A.norepinephrineB.epinephrineC.acetylcholineD.epinephrine and norepinephrineE.acetylcholine, epinephrine and norepinephrine

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