Chapter 7: Practice Test A

Question 1

Which ones make up 99.98% of the neurons in the body?

Answer 1

interneuron

Question 2

What part of the neuron contains neurotransmitters in vesicles?

Answer 2

axon terminals

Question 3

An action potential is caused by an influx of ________ ions into the cell.

Answer 3

sodium

Question 4

What is damaged if nerve impulses are blocked to muscles or glands?

Answer 4

motor neuron

Question 5

The bare regions of axonal membranes only found in myelinated axons are

Answer 5

nodes of Ranvier

Question 6

What are the two main functional subdivisions of the nervous system?

Answer 6

central and peripheral

Question 7

Which term means a nerve impulse has been initiated and is being transmitted?

Answer 7

action potential

Question 8

Neurons either conduct action potentials or remain at rest. This describes

Answer 8

the all-or-none response

Question 9

During repolarization, what ions are pumped out of the cell?

Answer 9

sodium

Question 10

Which one transmits impulses toward the CNS?

Answer 10

sensory neuron

Question 11

Impulse conduction is faster in neurons that are

Answer 11

myelinated

Question 12

What are the major positive ions outside of the neuron?

Answer 12

sodium ions

Question 13

The gap between two communicating neurons is termed

Answer 13

synaptic cleft

Question 14

Support cells in the central nervous system are collectively called

Answer 14

Neuroglia

Question 15

The part of the neuron that conducts nerve impulses away from the cell body is

Answer 15

Axon