Question

chapter 14 multiple choice question 24
1 part | -- of 1 point

drugs called beta - blockers ______.

are potent antidepressants

decrease heart rate and blood pressure

have widespread sympathetic effects

increase a dangerously low heart rate

Explanation:

Beta - blockers work by blocking beta - adrenergic receptors. This action leads to a reduction in the effects of the sympathetic nervous system on the heart. As a result, they decrease heart rate (because the heart's contractility and rate of beating are reduced) and blood pressure (since less forceful and less frequent heartbeats, along with vasodilation in some cases, lower blood pressure). Antidepressants are a different class of drugs, so beta - blockers are not potent antidepressants. They do not have widespread sympathetic effects (they block sympathetic effects). And they do not increase a dangerously low heart rate; instead, they can lower heart rate, so in cases of low heart rate, they would not be used to increase it.

Answer:

B. decrease heart rate and blood pressure (assuming the options are labeled as A: are potent antidepressants, B: decrease heart rate and blood pressure, C: have widespread sympathetic effects, D: increase a dangerously low heart rate)