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
Palatine Tonsils:
- Location: B. Oropharynx
The palatine tonsils are located on either side of the oropharynx, between the anterior and posterior pillars. They are the most commonly recognized tonsils and are often visible during a throat examination.
Lingual Tonsils:
- Location: B. Oropharynx
The lingual tonsils are located at the base of the tongue, also within the oropharynx. They are situated just posterior to the anterior lingual region.
Correct Answer is A
Explanation
A. This allows for rapid exchange of oxygen and nutrients: Capillaries have thin walls (one cell thick) to facilitate the rapid diffusion of gases (oxygen and carbon dioxide), nutrients, and waste products between blood and tissues.
B. This allows for red blood cell formation to occur: Red blood cells are formed in the bone marrow, not in capillaries.
C. There is no blood pressure within the capillaries: There is still blood pressure within capillaries, although it is lower than in arteries, so this is incorrect.
D. Blood does not travel through capillaries: Blood does indeed travel through capillaries as part of the circulatory system.
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