In the sympathetic component of the autonomic nervous system,norepinephrine acts to:

Question

Quizplus · Accepted Answer

Norepinephrine acts as a neurotransmitter in the sympathetic nervous system and binds to adrenergic receptors. When it binds to beta-1 adrenergic receptors in the heart, it increases heart rate and contractility, which in turn increases blood pressure. Therefore, choice A is the correct answer. B is incorrect because the actions of norepinephrine in the sympathetic nervous system can lead to an increase in blood pressure rather than hypotension. C is incorrect because norepinephrine causes constriction of peripheral blood vessels, which leads to an increase in blood pressure. D is incorrect because norepinephrine does not affect the release of serotonin from the brain.

In the Sympathetic Component of the Autonomic Nervous System,norepinephrine Acts