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Chapter 1: Q. 18 (page 7)

________ is released by motor nerve endings onto muscle.

a. Acetylcholine

b. Norepinephrine

c. Dopamine

d. Serotonin

Short Answer

Expert verified

Option a is the correct answer.

Step by step solution

01

Introduction

After the sympathetic nervous system (the typical adrenaline dump you experience after a "fight-or-flight" incident) is engaged, the parasympathetic nervous system restores organ function. Acetylcholine release affects target organs via lowering blood pressure, promoting digestion, and reducing heart rate.

02

The explanation for the correct answer

Acetylcholine is released onto postganglionic neurons, which are ordinarily found relatively close to the target organs, by the axons of preganglionic neurons. Although some emit nitric oxide, the majority of postganglionic neurons release acetylcholine onto their intended target organs.

03

The explanation for incorrect options

The rest of the options are irrelevant.

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