Question 1

Electrical signals are conducted toward the cell body of a neuron by its ________.

Accepted Answer

The answer of Electrical signals are conducted toward the cell...

Question 2

Which statement is consistent with the current understanding of neural tissue?

Accepted Answer

A)   A person is born with all of the neurons they will ever have.
B)   Most neurons formed in fetal development last a lifetime, but some brain regions in adults can generate new neurons.
C)   Neurons are constantly dying and being replaced throughout all regions of the brain.
D)   Stem cells in the brain become glia, which can later become neurons if there is a need for them to do so.E) A) and B)
F) A) and C)

Question 3

A bipolar neuron has

Accepted Answer

A)   two axons extending from the cell body.
B)   two dendrites extending from the cell body.
C)   one axon and one dendrite extending from the cell body.
D)   a single short process that extends from the cell body and then splits into a peripheral and a central branch.E) C) and D)
F) B) and C)

Question 4

A graded potential is one that

Accepted Answer

A)   is all or none (always the same intensity) .
B)   travels the length of the nerve fiber (is long-distance) .
C)   varies in size depending on the magnitude of the stimulus (larger voltage change for stronger stimulus) .
D)   lasts for several seconds after ion channels have opened, closed, and reset.E) All of the above
F) A) and B)

Question 5

A nerve

Accepted Answer

A)   contains a single axon.
B)   is found only in the CNS.
C)   carries only sensory information.
D)   carries information only toward the PNS.
E)   is a cablelike bundle of parallel axons.F) C) and D)
G) A) and C)

Question 6

Negatively charged protein molecules are more prevalent within a neuron's cytosol than in the interstitial fluid.

Accepted Answer

A) True 
 B)False

Question 7

In neurophysiology, the term "summation" refers to the addition of

Accepted Answer

A)   action potentials at the node of Ranvier.
B)   postsynaptic potentials at the initial segment.
C)   excitatory neurotransmitter molecules at a receptor.
D)   resting membrane potentials in a particular area of the brain.
E)   presynaptic hyperpolarizations.F) A) and B)
G) A) and E)

Question 8

Acetylcholine is a neurotransmitter frequently used in the autonomic nervous system.

Accepted Answer

A) True 
 B)False

Question 9

________ is the release of chemicals that locally regulate the response of neurons to neurotransmitters.

Accepted Answer

The answer of ________ is the release of chemicals that...

Question 10

The most crucial factor determining the resting potential of a neuron is the diffusion of

Accepted Answer

A)   potassium out of the cell through leak channels.
B)   potassium into the cell through gated channels.
C)   sodium out of the cell through leak channels.
D)   sodium into the cell through gated channels.E) A) and D)
F) A) and B)

Question 11

As a neuron's refractory period ends, its sodium channels are changing from

Accepted Answer

A)   their resting state to their inactivated state.
B)   their inactivated state to their resting state.
C)   their resting state to their activated state.
D)   their activated state to their resting state.E) B) and C)
F) A) and C)

Question 12

Which choice correctly orders the connective tissue wrappings of a nerve, beginning at the outermost layer?

Accepted Answer

A)   Perineurium → epineurium → endoneurium
B)   Perineurium → endoneurium → epineurium
C)   Epineurium → perineurium → endoneurium
D)   Epineurium → endoneurium → perineurium
E)   Endoneurium → perineurium → epineuriumF) None of the above
G) C) and E)

Question 13

The nervous system controls the activity of muscles and glands. Muscles and glands can generate changes and are therefore called

Accepted Answer

A)   afferents.
B)   effectors.
C)   stimuli.
D)   visceral.E) A) and B)
F) A) and D)

Question 14

The type of neuronal circuit that uses feedback to produce a repeated, cyclical stimulation of the circuit is a ________ circuit.

Accepted Answer

A)   converging
B)   diverging
C)   reverberating
D)   parallel-after-discharge
E)   None of the choices is correct.F) B) and C)
G) B) and E)

Question 15

The separation of oppositely charged ionic particles across a resting neuron's membrane results in a potential that is measured as a

Accepted Answer

A)   current.
B)   voltage.
C)   conductance.
D)   resistance.E) A) and C)
F) A) and B)

Question 16

Which division of the nervous system shows a greater capacity for regeneration?

Accepted Answer

A)   CNS
B)   PNSC) A) and B)
D) undefined

Question 17

The glial cell with perivascular feet that wrap around capillaries in the CNS is the

Accepted Answer

A)   astrocyte.
B)   ependymal cell.
C)   neurolemmocyte.
D)   microglial cell.
E)   oligodendrocyte.F) B) and E)
G) None of the above

Question 18

A neuron's membrane contains more potassium leak channels than sodium leak channels.

Accepted Answer

A) True 
 B)False

Question 19

A scientist observes a particular nerve fiber that is among the fastest at conducting action potentials in the body. Which of the following best describes its likely structure?

Accepted Answer

A)   Large diameter and myelinated
B)   Large diameter and unmyelinated
C)   Small diameter and myelinated
D)   Small diameter and unmyelinatedE) All of the above
F) C) and D)

Question 20

The cytoplasm within a cell body of a neuron is called the

Accepted Answer

A)   soma.
B)   perikaryon.
C)   neurokaryon.
D)   chromatophilic substance.
E)   chromatophobic substance.F) All of the above
G) A) and B)

Exam 12: Nervous System: Nervous Tissue

The cytoplasm within a cell body of a neuron is called the

Correct AnswerverifiedShow Answer

Which statement is consistent with the current understanding of neural tissue?

Correct AnswerverifiedShow Answer

The most crucial factor determining the resting potential of a neuron is the diffusion of

Correct AnswerverifiedShow Answer

As a neuron's refractory period ends, its sodium channels are changing from

Correct AnswerverifiedShow Answer

Which division of the nervous system shows a greater capacity for regeneration?

Correct AnswerverifiedShow Answer

Acetylcholine is a neurotransmitter frequently used in the autonomic nervous system.

Correct AnswerverifiedShow Answer

The separation of oppositely charged ionic particles across a resting neuron's membrane results in a potential that is measured as a

Correct AnswerverifiedShow Answer

The nervous system controls the activity of muscles and glands. Muscles and glands can generate changes and are therefore called

Correct AnswerverifiedShow Answer

Negatively charged protein molecules are more prevalent within a neuron's cytosol than in the interstitial fluid.

Correct AnswerverifiedShow Answer

A graded potential is one that

Correct AnswerverifiedShow Answer

The glial cell with perivascular feet that wrap around capillaries in the CNS is the

Correct AnswerverifiedShow Answer

The type of neuronal circuit that uses feedback to produce a repeated, cyclical stimulation of the circuit is a ________ circuit.

Correct AnswerverifiedShow Answer

A bipolar neuron has

Correct AnswerverifiedShow Answer

In neurophysiology, the term "summation" refers to the addition of

Correct AnswerverifiedShow Answer

A neuron's membrane contains more potassium leak channels than sodium leak channels.

Correct AnswerverifiedShow Answer

Electrical signals are conducted toward the cell body of a neuron by its ________.

Correct AnswerverifiedShow Answer

A scientist observes a particular nerve fiber that is among the fastest at conducting action potentials in the body. Which of the following best describes its likely structure?

Correct AnswerverifiedShow Answer

A nerve

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Which choice correctly orders the connective tissue wrappings of a nerve, beginning at the outermost layer?

Correct AnswerverifiedShow Answer

________ is the release of chemicals that locally regulate the response of neurons to neurotransmitters.

Correct AnswerverifiedShow Answer

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