CH 11 - Neurons Practice Exam

Question 1

The part of a neuron that conducts impulses away from its cell body is called:

a.) Schwann cell
b.) dendrite
c.) axon
d.) neurolemma

Answer 1

c.) axon

Question 2

Which of the choices below describes the ANS:

a.) sensory neurons that convey information from somatic receptors in the head, boy wall, and limbs and from receptors from the special senses of vision hearing, taste, and smell to the CNS
b.) motor fibers that conduct nerve impulses from the CNS to skeletal muscles
c.) sensory and motor neurons that supply the digestive tract.
d.) motor fibers that conduct nerve impulses from CNS to smooth muscle, cardiac muscle, and glands

Answer 2

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

Question 3

What is the role of ACH?

a.) stimulate the production of serotonin
b.) act as a transmitting agent
c.) destroy ACH a brief period after its release by the axon endings
d.) amplify or enhance the effect of ACH

Answer 3

c.) destroy ACH a brief period after its release by the axon endings

Question 4

A neuron that has as its primary function the job of connecting other neurons is called:

a.) afferent neuron
b.) glial cell
c.) association neuron
d.) efferent neuron

Answer 4

c.) association neuron

Question 5

Neuroglia that control the chemical environment around neurons is called:
a.) oligodendrocytes
b.) astrocytes
c.) Schwann cells
d.) microglia

Answer 5

b.) astrocytes

Question 6

Which of the following describes the nervous system’s integrative function?

a.) acetylcholine
b.) gamma-aminobutyric acid
c.) norepinephrine
d.) cholinesterase

Answer 6

a.) acetylcholine

Question 7

Which of the following describes the nervous system’s integrative function?

a.) analyze sensory information, store information, make decisions
b.) responds to stimuli by gland secretion or muscle contraction
c.) senses changes in the environment

Answer 7

a.) analyze sensory information, store information, make decisions

Question 8

Immediately after an action potential has peaked, which cellular gates open?

a.) sodium
b.) potassium
c.) calcium
d.) chloride

Answer 8

b.) potassium

Question 9

Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane?

a.) sodium gates will open first, then close as potassium gates open
b.) specific sodium gates
c.) specific potassium gates will open
d.) a single type of channels will open, permitting simultaneous flow of sodium and potassium

Answer 9

d.) a single type of channels will open, permitting simultaneous flow of sodium and potassium

Question 10

Which of the following is NOT true of graded potentials?

a.) they can form on receptor endings
b.) they are short-lived
c.) they increase amplitude as they move away from the stimulus point
d.) they can be called postsynaptic potentials

Answer 10

c.) they increase amplitude as they move away from the stimulus point

Question 11

Which of the following is false or incorrect?

a.) an excitatory postsynaptic potential occurs if the excitatory effect is greater than the inhibitory effect but less than threshold
b.) an inhibitory postsynaptic potential occurs if the inhibitory effect is greater than the excitatory, causing hyperpolarization of the membrane
c.) a nerve impulse occurs if the excitatory and inhibitory effects are equal

Answer 11

c.) a nerve impulse occurs if the excitatory and inhibitory effects are equal

Question 12

Which of the following is NOT a special characteristic of neurons?
a.) they have extreme longevity
b.) they have an exceptionally high metabolic rate
c.) they are mitotic
d.) they conduct impulses

Answer 12

c.) they are mitotic

Question 13

In what way does the interior surface of a cell membrane of a resting (nonconductive) neuron differ from the external environment? The interior is____.

a.) negatively charged and contains more sodium
b.) negatively charged and contains less sodium
c.) positively charged and contains more sodium
d.) positively charged and contains less sodium

Answer 13

b.) negatively charged and contains less sodium

Question 14

Saltatory conduction is made possible by:

a.) the myelin sheath
b.) large nerve fibers
c.) erratic transmission of nerve impulses
d. diphasic impulses

Answer 14

a.) the myelin sheath

Question 15

Which of the following is NOT a function of the ANS?

a.) innervation of glands
b.) innervation of smooth muscle of the digestive tract
c.) innervation of skeletal muscle
d.) innervation of cardiac muscle

Answer 15

c.) innervation of skeletal muscle

Question 16

An inhibitory postsynaptic potential (IPSP) is associated with ___.

a.) a change in sodium ion permeability
b.) lowering the threshold for an action potential to occur
c.) opening of voltage-regulated channels
d.) hyperpolarization

Answer 16

d.) hyperpolarization