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Chapter 9

front 1

Which of the neuroglial cell types shown are found in the PNS?

back 1

E

front 2

The autonomic nervous system is under voluntary control; whereas, the somatic nervous system is involuntary.

back 2

False

front 3

Which of the following is NOT a type of circuit?

back 3

pre-discharge circuits

front 4

Which of the following types of glial cells produces the myelin sheaths that insulate axons, or nerve fibers, in the central nervous system (CNS)?

back 4

oligodendrocytes

front 5

Which of the following is the conducting region of the neuron?

back 5

axon

front 6

Which area would contain an abundance of vesicles containing neurotransmitter?

back 6

E

front 7

Which of the choices below describes the ANS?

back 7

motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands

front 8

Which of the following allows us to consciously control our skeletal muscles?

back 8

the somatic nervous system

front 9

During depolarization, the inside of the neuron's membrane becomes less negative.

back 9

True

front 10

The action potential is caused by permeability changes in the plasma membrane.

back 10

True

front 11

Neurons in the CNS are organized into functional groups.

back 11

True

front 12

The part of a neuron that conducts impulses away from its cell body is called a(n) ________.

back 12

axon

front 13

Which neuroglia are the most abundant and versatile of the glial cells?

back 13

astrocytes

front 14

What structural classification describes this neuron?

back 14

multipolar

front 15

The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________.

back 15

absolute refractory period

front 16

If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them.

back 16

True

front 17

What part of the nervous system performs information processing and integration?

back 17

central nervous system

front 18

Axon diameter and degree of myelination determine nerve impulse conduction velocity

back 18

True

front 19

Which of the following are gaps found along a myelin sheath?

back 19

nodes of Ranvier

front 20

Which areas of this neuron would be classified as receptive regions?

back 20

Both A and B

front 21

Schwann cells are functionally similar to ________.

back 21

oligodendrocytes

front 22

Neuroglia that control the chemical environment around neurons by buffering ions such as potassium and recapturing and recycling neurotransmitters are ________.

back 22

astrocytes

front 23

What does the central nervous system use to determine the strength of a stimulus?

back 23

frequency of action potentials

front 24

Which of the following peripheral nervous system (PNS) neuroglia form the myelin sheaths around larger nerve fibers in the PNS?

back 24

Schwann cells

front 25

The term central nervous system refers to the ________.

back 25

brain and spinal cord