a&p chapter 11

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Fundamentals of Nervous system and Nervous tissues
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1

which of the following is not a function of astrocytes?

provide the defense for the CNS

2

which of the following choices below describes the ANS

motor fibers that conduct nerve impulses from the CNS to skeletal muscles

3

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

frequency of action potentials

4

bipolar neurons are commonly

found in the retina of the eye

5

which of the followings describes the nervous system intergrative function

analyzes sensory information stores information makes decisions

6

which of the followings is not characteristic of neurons?

they are mitotic

7

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

absoulute refractory period

8

collections of nerve cell bodies outside the central nervous system are called

ganglia

9

a neuron that has as its primary function the job of connecting other neurons is called an

association neuron

10

saltatory conduction is made possible by

the myelin sheath

11

which of the following is not a chemical class of neurotransmitters?

nucleic acid

12

select the correct statement regarding synapses

the synaptic cleft prevents an impulse from being transmitted directly from one neuron to antoher

13

an inhibitory postsynaptic potential (IPSP) is associated with

hyperpolarization

14

when a sensory neuron is excited by some form of energy, the resulting graded potential Is called a(n)

generator potential

15

which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone

endorphin

16

which of the followings describes the excitatory postsynaptic potential

short distance depolarization

17

which of the followings is not a recognized structural classification for neurons

pseudopolar

18

the most abundant class of neuron in the central nervous system is

multipolar

19

the rabies virus travels to the CNS via

retrograde intraaxonal transport

20

sensory neurons of the PNS are

unipolar

21

which of the following is not involved in creating the resting potential of a neuron

membrane permeability for sodium ions greater that potassium ions

22

the following are the main steps in the generation of an action potential.

1. sodium channels are inactivated

2. voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization.

3.sodium channels regain their normal properties.

4.a graded depolarization brings an area of an excitable membrane to threshold.

5.a temporary hyperpolarization occurs.

6.sodium channel activation occurs.

7. sodium ions enter the cell and depolarization occurs.

d.4,6,,7,1,2,3,5.

23

in the process of continuous action potential propagation,

a, b, and c

24

which of the following types of nerve fiber possesses the fastest speed of impulse propagation

type A

25

which of the following does not influence the time necessary for a nerve impulse to be transmitted

whether or not the impulse begins in the CNS