Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

What chemicals is released by the axon terminals of a motor neuron at a neuromuscular junction?

  1. a. ACh
  2. b. serotonin
  3. c. dopamine
  4. d. epinephrine

Summary Introduction

Introduction: Neurons are brain cells that are specialized to transmit nerve impulses. A neuron consists of cell body, dendrites, and an axon. Synapse is the region where neurotransmitter (a signaling molecule) released by the axon terminals signals another cell. The signal-sending neuron at the synapse is called presynaptic cell, and the signal-receiving neuron is called postsynaptic cell.


Reasons for the correct statement:

Neuromuscular junction is a type of synapse between a motor neuron and a skeletal muscle fiber. The motor neuron releases the neurotransmitter acetylcholine (ACh) at the neuromuscular junction.

Hence, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “serotonin”. Serotonin elevates mood and plays a role in memory. It is mainly released by the neurons of the raphe nuclei in the brain. So, option b. is incorrect answer...

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