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Multiple Choice Quiz
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1

A neuron
A)is the basic unit of the nervous system.
B)is a nerve cell.
C)operates by generating electrical signals.
D)may communicate with other neurons via chemical signals.
E)is described by all of the above.
2

The equilibrium potential
A)of a given ion across a membrane is a function of the concentration of that ion on both sides of the membrane.
B)of a given ion across a membrane is the potential at which there is no net movement of that ion across the membrane due to electrochemical forces.
C)of Cl- across a typical nerve cell membrane is approximately the same as the resting potential of most nerve cells.
D)A and B.
E)A, B and C.
3

Threshold stimuli are those which are strong enough to
A)repolarize the neuron membrane.
B)cause a net flux of positively charged ions from inside to outside the cell.
C)cause a net flux of positively charged ions from outside to inside the cell.
D)close potassium channels to the point that an action potential is initiated.
E)open potassium channels to the point that an action potential is initiated.
4

During an action potential,
A)voltage-gated Na+ channels in the membrane open in response to depolarization.
B)ligand-gated K+ channels in the membrane open in response to neurotransmitter released from adjacent membrane.
C)the increase in Na+ permeability in the membrane is an example of positive feedback.
D)A and C.
E)A, B and C.
5

Which of the following statements concerning the propagation of action potentials is not correct?
A)Saltatory conduction occurs in myelinated nerve fibers.
B)During conduction of an action potential, current flows from the active area of the membrane to the adjacent inactive area, thereby decreasing the potential in the inactive area to threshold.
C)Action potential propagation is faster in myelinated fibers than in unmyelinated ones.
D)Action potential propagation is faster in large-diameter fibers than in small-diameter ones.
E)Action potential propagation is faster for strong stimuli than for weaker stimuli.
6

Postsynaptic potentials
A)Directly result from the opening of voltage-gated ion channels.
B)may be depolarizing or hyperpolarizing.
C)may be summed.
D)B and C.
E)A, B and C.
7

An EPSP is
A)a type of graded potential.
B)caused by an increase in the permeability of the postsynaptic membrane to all small ions.
C)hyperpolarizing.
D)sufficient by itself to generate an action potential.
E)all-or-none in character.
8

An IPSP is
A)depolarizing.
B)caused by an increase in the permeability of the subsynaptic membrane to K+ and/or Cl- .
C)caused by an increase in the permeability of the subsynaptic membrane to Na+.
D)caused by an increase in the permeability of the subsynaptic membrane to all small ions.
E)described by none of the above.
9

In the biosynthesis of catecholamines,
A)the rate-limiting step is the conversion of L-Dopa to dopamine.
B)the rate-limiting step is the conversion of tyrosine to dopamine.
C)the rate-limiting step is catalyzed by tyrosine hydroxylase.
D)epinephrine is converted to norepinephrine.
E)none of the above describes catecholamine biosynthesis.
10

Degeneration of certain cholinergic neurons occurs in people with
A)Alzheimer's disease.
B)multiple sclerosis.
C)diabetes mellitis.
D)Parkinson's disease.
E)none of the above.
11

Which of the following is not synthesized in most postganglionic sympathetic neurons?
A)L-Dopa
B)Dopamine
C)Norepinephrine
D)Acetylcholine
E)B and D
12

Which is not true of neuromodulators
A)modify the postsynaptic neuron’s response to a specific neurotransmitter
B)may change the presynaptic neuron’s synthesis of a neurotransmitter
C)may change the presynaptic neuron’s release of a transmitter
D)may be released by the presynaptic neuron along with the neurotransmitter
E)actions are faster than neurotransmitters
13

The cerebral cortex
A)is where basic afferent information is collected and processed
B)is made up of right and left cerebral hemispheres
C)receives input from the thalamus, brainstem and other regions of cortex
D)A and C
E)All of the above
14

The hypothalamus is made up of cell groups deep in the forebrain and is associated with posture and balance
A)True
B)False
15

The autonomic nervous system
A)contains preganglionic fibers
B)contains post ganglionic fibers
C)contains only parasympathetic components
D)provides efferent innervation of skeletal muscle
E)A and B
16

In parasympathetic divisions of the autonomic nervous system acetylcholine is the major neurotransmitter released between the pre- and post-ganglionic fibers.
A)True
B)False
17

The blood brain barrier:
A)functions to control the exchange of substances between blood and the extracellular fluid in the CNS
B)is comprised of the cells that line the largest blood vessles in the brain
C)is comprised of the cells that line the smallest blood vessles in the brain
D)A and C
18

18. The somatic motor portion of the peripheral nervous system:
A)contains efferent fibers
B)has cell bodies located in the brainstem only
C)have large diameter mylenated axons
D)use acetylcholine as their neurotransmitter
E)A and C and D





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