Heart rate is stimulated by the following except:*1 pointa. Increased level of the catecholamineb. The vagus nerveb. Excess thyroid hormoned. The sympathetic system
Question
Heart rate is stimulated by the following except:*1 pointa. Increased level of the catecholamineb. The vagus nerveb. Excess thyroid hormoned. The sympathetic system
Solution
The correct answer is b. The vagus nerve.
Here's why:
a. Increased level of the catecholamine: Catecholamines (like adrenaline) are hormones produced by the adrenal glands. They are part of the body's "fight or flight" response and they increase heart rate.
b. The vagus nerve: This is part of the parasympathetic nervous system, which is responsible for "rest and digest" activities. When the vagus nerve is stimulated, it actually slows down the heart rate, not increases it.
c. Excess thyroid hormone: The thyroid hormone affects almost every system in the body, including the heart. An excess of this hormone can cause an increased heart rate.
d. The sympathetic system: This is part of the autonomic nervous system that controls the body's response to stress or danger. It increases heart rate among other things.
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