EXAM IV MC

Question 1

Which of the following is not a function of astrocytes?

Answer 1

provide the defense for the CNS

Question 2

Which of the choices below describes the ANS?

Answer 2

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

Question 3

What are ciliated CNS neuroglia that plays an active role in moving the cerebrospinal fluid called?

Answer 3

ependymal cells

Question 4

The sheath of Schwann is also called the ________.

Answer 4

neurilemma

Question 5

Bipolar neurons are commonly found in the ________.

Answer 5

retina of the eye

Question 6

Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?

Answer 6

acetylcholine

Question 7

Which of the following describes the nervous system integrative function?

Answer 7

analyzes sensory information, stores information, makes decisions

Question 8

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

Answer 8

absolute refractory period

Question 9

Which of the following is not a special characteristic of neurons?

Answer 9

They are mitotic.

Question 10

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

Answer 10

axon

Question 11

Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?

Answer 11

voltage-gated channel

Question 12

An impulse from one nerve cell is communicated to another nerve cell via the ________.

Answer 12

synapse

Question 13

What is the role of acetylcholinesterase?

Answer 13

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

Question 14

Which of the following is not a function of the autonomic nervous system?

Answer 14

innervation of skeletal muscle

Question 15

Collections of nerve cell bodies outside the central nervous system are called ________.

Answer 15

ganglia

Question 16

The term central nervous system refers to the ________.

Answer 16

brain and spinal cord

Question 17

The substance released at axon terminals to propagate a nervous impulse is called a(n) ________.

Answer 17

neurotransmitter

Question 18

A neuron that has as its primary function the job of connecting other neurons is called a(n) ________.

Answer 18

association neuron

Question 19

Saltatory conduction is made possible by ________.

Answer 19

the myelin sheath

Question 20

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

Answer 20

nucleic acid

Question 21

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) A nerve impulse occurs if the excitatory and inhibitory effects are equal.
C) An inhibitory postsynaptic potential occurs if the inhibitory effect is greater than the excitatory, causing hyperpolarization of the membrane.

Answer 21

A nerve impulse occurs if the excitatory and inhibitory effects are equal.

Question 22

Select the correct statement regarding synapses.
A) Cells with interconnected cytoplasm are chemically coupled.
B) The release of neurotransmitter molecules gives cells the property of being electrically coupled.
C) Neurotransmitter receptors are located on the axons of cells.
D) The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another.

Answer 22

The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another.

Question 23

Ependymal cells help to circulate the ________.

Answer 23

cerebrospinal fluid

Question 24

Neuroglia that controls the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are ________.

Answer 24

astrocytes

Question 25

Schwann cells are functionally similar to ________.

Answer 25

oligodendrocytes

Question 26

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

Answer 26

potassium

Question 27

Nerve cell adhesion molecules (N-CAMs) are crucial for the development of ________.

Answer 27

neural connections

Question 28

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

Answer 28

A single type of channel will open, permitting simultaneous flow of sodium and potassium.

Question 29

When a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n) ________.

Answer 29

generator potential

Question 30

Which of the following is not true of graded potentials?
A) They are short-lived.
B) They can form on receptor endings.
C) They increase amplitude as they move away from the stimulus point.
D) They can be called postsynaptic potentials.

Answer 30

They increase amplitude as they move away from the stimulus point.

Question 31

Which of the following is true about the movement of ions across excitable living membranes?

Answer 31

Some ions are prevented from moving down their concentration gradients by ATP-driven pumps.

Question 32

A second nerve impulse cannot be generated until the membrane potential ________.

Answer 32

has been reestablished

Question 33

In what way does the interior surface of a cell membrane of a resting (non-conducting) neuron differ from the external environment? The interior is ________.

Answer 33

negatively charged and contains less sodium

Question 34

If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon the impulse would spread ________.

Answer 34

bidirectionally

Question 35

Neurons may be classified according to several characteristics. Which of the following is correct?

Answer 35

Group C fibers are not capable of saltatory conduction.

Question 36

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

Answer 36

hyperpolarization

Question 37

Select the correct statement about serial processing.
A) Spinal reflexes are an example of serial processing.
B) Input travels along several different pathways.
C) Smells are processed by serial pathways.
D) Memories are triggered by serial processing.

Answer 37

Spinal reflexes are an example of serial processing.