What is the effect of acetylcholine secretion?
It decreases the heart rate.
It increases the heart rate.
It increases the rate of spontaneous depolarization
It shortens the time for repolarization.
The Correct Answer is A
A. It decreases the heart rate.: Acetylcholine is a neurotransmitter that binds to receptors in the heart, leading to a decrease in heart rate by activating the parasympathetic nervous system.
B. It increases the heart rate.: Acetylcholine does not increase heart rate; that function is primarily associated with norepinephrine, which is part of the sympathetic nervous system.
C. It increases the rate of spontaneous depolarization: Acetylcholine actually decreases the rate of spontaneous depolarization in pacemaker cells of the heart, leading to a slower heart rate.
D. It shortens the time for repolarization.: Acetylcholine does not shorten repolarization; it increases the duration of repolarization due to the hyperpolarizing effects on the heart cells.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Brain and aortic arch: The aortic arch contains peripheral chemoreceptors, but the central chemoreceptor is in the medulla.
B. Medulla of the brain stem: Central chemoreceptors located in the medulla monitor the levels of carbon dioxide (via pH changes) in the cerebrospinal fluid to regulate breathing.
C. Carotid arteries and brain stem: The carotid arteries contain peripheral chemoreceptors, but not central chemoreceptors.
D. Carotid arteries and aortic arch: These locations house peripheral chemoreceptors, not central ones.
Correct Answer is A
Explanation
A. Inferior mesenteric artery: This artery is responsible for supplying blood to the distal part of the large intestine, including the descending colon, sigmoid colon, and rectum.
B. Inferior phrenic artery: This artery supplies blood to the diaphragm, not the large intestine or rectum.
C. Gonadal artery: The gonadal arteries supply blood to the reproductive organs, such as the ovaries or testes, not the large intestine.
D. Renal artery: The renal arteries supply blood to the kidneys and are unrelated to the blood supply of the large intestine or rectum.
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