Chapter 11 Part 8 (multiple choice) Flashcards Preview

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Flashcards in Chapter 11 Part 8 (multiple choice) Deck (15):
1

Which of the following is not a function of astrocytes?
A) anchor neurons to blood vessels
B) support and brace neurons
C) control the chemical environment around neurons
D) guide the migration of young neurons, synapse formation, and helping to determine capillary permeability
E) provide the defense for the CNS

E) provide the defense for the CNS

2

Which of the choices below describes the ANS?
A) motor fibers that conduct nerve impulses from the CNS to skeletal muscles
B) sensory and motor neurons that supply the digestive tract
C) sensory neurons that convey information from somatic receptors in the head, body wall, and limbs and from receptors from the special senses of vision, hearing, taste, and smell to the CNS
D) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands

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

3

What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called?
A) Schwann cells
B) oligodendrocytes
C) ependymal cells
D) astrocytes

C) ependymal cells

4

What does the central nervous system use to determine the strength of a stimulus?
A) origin of the stimulus
B) frequency of action potentials
C) size of action potentials
D) type of stimulus receptor

B) frequency of action potentials

5

Bipolar neurons are commonly ________.
A) found in the retina of the eye
B) found in ganglia
C) motor neurons
D) called neuroglial cells

A) found in the retina of the eye

6

Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
A) gamma aminobutyric acid
B) acetylcholine
C) cholinesterase
D) norepinephrine

B) acetylcholine

7

Which of the following describes the nervous system integrative function?
A) analyzes sensory information, stores information, makes decisions
B) responds to stimuli by gland secretion or muscle contraction
C) senses changes in the environment

A) analyzes sensory information, stores information, makes decisions

8

The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________.
A) resting period
B) absolute refractory period
C) repolarization
D) depolarization

B) absolute refractory period

9

Which of the following is not characteristic of neurons?
A) They are mitotic.
B) They have extreme longevity.
C) They have an exceptionally high metabolic rate.
D) They conduct impulses.

A) They are mitotic.

10

The part of a neuron that conducts impulses away from its cell body is called a(n) ________.
A) dendrite
B) neurolemma
C) Schwann cell
D) axon

D) axon

11

Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?
A) leakage channel
B) mechanically gated channel
C) voltage-gated channel
D) ligand-gated channel

C) voltage-gated channel

12

An impulse from one nerve cell is communicated to another nerve cell via the ________.
A) synapse
B) cell body
C) receptor
D) effector

A) synapse

13

What is the role of acetylcholinesterase?
A) act as a transmitting agent
B) amplify or enhance the effect of ACh
C) stimulate the production of acetylcholine
D) destroy ACh a brief period after its release by the axon endings

D) destroy ACh a brief period after its release by the axon endings

14

Which of the following is not a function of the autonomic nervous system?
A) innervation of smooth muscle of the digestive tract
B) innervation of glands
C) innervation of skeletal muscle
D) innervation of cardiac muscle

C) innervation of skeletal muscle

15

Collections of nerve cell bodies outside the central nervous system are called ________.
A) tracts
B) nuclei
C) nerves
D) ganglia

D) ganglia