Question 1

Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle?

Accepted Answer

A)  Norepinephrine
B)  Dopamine
C)  Histamine
D)  Acetylcholine
E)   β\betaβ -endorphin

Question 2

In a neuron,the opening of sodium gates typically leads to __________.

Accepted Answer

A)  repolarization of the plasma membrane
B)  hyperpolarization of the plasma membrane
C)  depolarization of the plasma membrane
D)  drifting of plasma membrane voltage toward a more negative value
E)  plasma membrane voltage returning to the resting membrane potential

Question 3

Memories are formed by neural pathways of modified synapses.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following ions has the greatest influence on the resting membrane potential?

Accepted Answer

A)  Sodium
B)  Chloride
C)  Calcium
D)  Phosphate
E)  Potassium

Question 5

When a neuron is stimulated,Na+ gates open and allow Na+ to exit the cell.

Accepted Answer

A) True 
 B)False

Question 6

Some __________ neurons are specialized to detect stimuli,whereas __________ neurons send signals to the effectors of the nervous system.

Accepted Answer

A)  efferent; afferent
B)  afferent; efferent
C)  motor; sensory
D)  efferent; association
E)  afferent; association

Question 7

A cholinergic synapse uses __________ as its neurotransmitter.

Accepted Answer

A)  monoamine
B)  acetylcholine
C)  epinephrine
D)  norepinephrine
E)  catecholamine

Question 8

Norepinephrine is a monoamine.

Accepted Answer

A) True 
 B)False

Question 9

In PNS nerve fiber regeneration,how is a growing axon directed to its original destination?

Accepted Answer

A)  It grows within a regeneration tube.
B)  The axonal terminals grow towards the soma until the two severed fragments are reunited.
C)  The axon grows a collateral that is directed by growth factors secreted by the postsynaptic neuron.
D)  Injured Schwann cells produce a trail of prostaglandins to the original destination.

Question 10

Nerves are __________ of the nervous system.

Accepted Answer

A)  organs
B)  tissues
C)  organ systems
D)  organelles
E)  cells

Question 11

Inhibitory postsynaptic potentials (IPSPs) are associated with which of the following?

Accepted Answer

A)  Depolarization of the cell membrane
B)  Repolarization of the cell membrane
C)  Hyperpolarization of the cell membrane
D)  No change in the cell membrane potential
E)  No change of the threshold

Question 12

While a neuron membrane is depolarizing its __________.

Accepted Answer

A)  chloride gates are partially open
B)  chloride gates are fully open
C)  potassium gates are fully open
D)  sodium gates are partially open
E)  sodium gates are fully open

Question 13

In the brain,neurons are more abundant than neuroglia.

Accepted Answer

A) True 
 B)False

Question 14

In order to regenerate,a peripheral nerve fiber must have which of the following?

Accepted Answer

A)  All dendrites intact
B)  At least half the length of the fiber intact
C)  At least the entire axon and neurilemma intact
D)  The soma and at least some neurilemma intact
E)  At least part of the soma intact

Question 15

Most neurons have multiple dendrites.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is true regarding unmyelinated nerve fibers in the PNS?

Accepted Answer

A)  A Schwann cell folds its plasma membrane around several fibers .
B)  A Schwann cells wraps its plasma membrane around each individual fiber as it does with myelinated fibers.
C)  An oligodendrocyte cells wraps its plasma membrane around each fiber as it does with myelinated fibers.
D)  Satellite cells cluster around each axon to form a pseudo-myelin sheath.

Question 17

All of the following are typical characteristics of neurotransmitters except __________.

Accepted Answer

A)  they are synthesized by a presynaptic neuron
B)  they are released in response to stimulation
C)  they are released into the bloodstream before reaching the postsynaptic cell
D)  they bind to specific receptors on the postsynaptic cell
E)  they alter the physiology of the postsynaptic cell

Question 18

What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?

Accepted Answer

A)  There are no internodes in unmyelinated fibers.
B)  There are more internodes in unmyelinated fibers.
C)  Facilitated diffusion of sodium and potassium is faster in myelinated fibers.
D)  Active transport of sodium and potassium is faster in myelinated fibers.
E)  Diffusion of ions along the axoplasm is faster.

Question 19

The respiratory center gathers information from a variety of sources in order to set the rate and depth of breathing.This is an example of what type of neural circuit?

Accepted Answer

A)  Convergent
B)  Divergent
C)  Reverberating
D)  Parallel after-discharge

Question 20

In which part of a neuron is the postsynaptic membrane usually found?

Accepted Answer

A)  Synaptic knob
B)  Axon
C)  Dendrite
D)  Perikaryon
E)  Axon collateral

Exam 12: Nervous Tissue

In PNS nerve fiber regeneration,how is a growing axon directed to its original destination?

Correct AnswerverifiedShow Answer

Norepinephrine is a monoamine.

Correct AnswerverifiedShow Answer

What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?

Correct AnswerverifiedShow Answer

Memories are formed by neural pathways of modified synapses.

Correct AnswerverifiedShow Answer

All of the following are typical characteristics of neurotransmitters except __________.

Correct AnswerverifiedShow Answer

In which part of a neuron is the postsynaptic membrane usually found?

Correct AnswerverifiedShow Answer

Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle?

Correct AnswerverifiedShow Answer

Which of the following ions has the greatest influence on the resting membrane potential?

Correct AnswerverifiedShow Answer

In a neuron,the opening of sodium gates typically leads to __________.

Correct AnswerverifiedShow Answer

In order to regenerate,a peripheral nerve fiber must have which of the following?

Correct AnswerverifiedShow Answer

Nerves are __________ of the nervous system.

Correct AnswerverifiedShow Answer

The respiratory center gathers information from a variety of sources in order to set the rate and depth of breathing.This is an example of what type of neural circuit?

Correct AnswerverifiedShow Answer

In the brain,neurons are more abundant than neuroglia.

Correct AnswerverifiedShow Answer

Some __________ neurons are specialized to detect stimuli,whereas __________ neurons send signals to the effectors of the nervous system.

Correct AnswerverifiedShow Answer

A cholinergic synapse uses __________ as its neurotransmitter.

Correct AnswerverifiedShow Answer

Inhibitory postsynaptic potentials (IPSPs) are associated with which of the following?

Correct AnswerverifiedShow Answer

Most neurons have multiple dendrites.

Correct AnswerverifiedShow Answer

When a neuron is stimulated,Na+ gates open and allow Na+ to exit the cell.

Correct AnswerverifiedShow Answer

While a neuron membrane is depolarizing its __________.

Correct AnswerverifiedShow Answer

Which of the following is true regarding unmyelinated nerve fibers in the PNS?

Correct AnswerverifiedShow Answer

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Some neurons are specialized to detect stimuli,whereas neurons send signals to the effectors of the nervous system.

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When a neuron is stimulated,Na⁺ gates open and allow Na⁺ to exit the cell.

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