Question 1

Which of the following is true about threshold for an action potential?

Accepted Answer

A)   It is more positive than the resting membrane potential.
B)   Voltage-gated potassium channels begin to close.
C)   Voltage-gated potassium channels begin to open.
D)   The membrane begins to hyperpolarize.
E)   Threshold for a typical neuron is approximately -30 mV.

Question 2

Sensory neurons of the PNS are

Accepted Answer

A)   unipolar.
B)   bipolar.
C)   anaxonic.
D)   multipolar.
E)   tripolar.

Question 3

________ are the most numerous type of neuron in the CNS.

Accepted Answer

A)   Sensory neurons
B)   Motor neurons
C)   Unipolar neurons
D)   Bipolar neurons
E)   Interneurons

Question 4

Small, wandering cells that engulf cell debris and pathogens in the CNS are called

Accepted Answer

A)   astrocytes.
B)   satellite cells.
C)   oligodendrocytes.
D)   microglia.
E)   ependymal cells.

Question 5

In-Text Figure Based Questions
-The axon hillock is a region between what two general regions of a neuron? (Figure 12-2)

Accepted Answer

A)   dendrites and cell body
B)   nucleolus and nucleus
C)   axon and axon terminals
D)   cell body and axon
E)   dendrites and telodendria

Question 6

Type ________ fibers have the largest diameter axons.

Accepted Answer

A)   S
B)   F
C)   A
D)   B
E)   C

Question 7

Neurons that have one axon and one dendrite, with the soma in between, are called

Accepted Answer

A)   anaxonic.
B)   unipolar.
C)   bipolar.
D)   tripolar.
E)   multipolar.

Question 8

When pressure is applied to neural tissue, all of the following effects are possible except

Accepted Answer

A)   a decrease in blood flow.
B)   a decrease in available oxygen.
C)   a change in neuron excitability.
D)   glial cells degenerate.
E)   neurons are triggered to divide.

Question 9

________ line the brain ventricles and spinal canal.

Accepted Answer

A)   Astrocytes
B)   Satellite cells
C)   Oligodendrocytes
D)   Microglia
E)   Ependymal cells

Question 10

Ions can move across the plasma membrane in which of the following ways?

Accepted Answer

A)   through voltage-gated channels as in the action potential
B)   through passive or leak channels
C)   by ATP-dependent ion pumps like the sodium-potassium exchange pump
D)   through chemically gated channels as in neuromuscular transmission
E)   All of the answers are correct.

Question 11

The ________ principle states that the size and speed of the action potential are independent of the stimulus strength.

Accepted Answer

A)   threshold
B)   all-or-none
C)   summation
D)   polarization
E)   potential

Question 12

The ________ division of the nervous system carries motor commands to muscles and glands.

Accepted Answer

A)   spinal
B)   peripheral
C)   autonomic
D)   afferent
E)   efferent

Question 13

Figure 12-1 The Neuron
 
Use Figure 12-1 to answer the following questions:
-Identify the structure labeled "4."

Accepted Answer

A)   synaptic terminals
B)   telodendria
C)   dendritic spines
D)   collateral branches
E)   axons

Question 14

Which of the following is not a function of astrocytes?

Accepted Answer

A)   They create a three dimensional framework for the CNS.
B)   They maintain the blood-brain barrier.
C)   They guide neuron development.
D)   They rebuild injured neurons.
E)   They adjust the composition of the interstitial tissue.

Question 15

Which of the following is not involved in creating the resting membrane potential of a neuron?

Accepted Answer

A)   diffusion of potassium ions out of the cell
B)   diffusion of sodium ions into the cell
C)   membrane permeability for sodium ions greater than potassium ions
D)   membrane permeability for potassium ions greater than sodium ions
E)   The interior of the plasma membrane has an excess of negative charges.

Question 16

Which type of synapse is most common in the nervous system?

Accepted Answer

A)   chemical
B)   electrical
C)   mechanical
D)   processing
E)   radiative

Question 17

During repolarization of a neuron

Accepted Answer

A)   sodium ions move out of the cell.
B)   potassium ions move out of the cell.
C)   potassium ions move into the cell.
D)   both sodium and potassium ions move into the cell.
E)   sodium ions move into the cell.

Question 18

The presence of ________ dramatically increases the speed at which an action potential moves along an axon.

Accepted Answer

A)   a capsule
B)   plasma protein
C)   neurilemma
D)   glial cells
E)   myelin

Question 19

Figure 12-2 The Nerve Action Potential
 
Use Figure 12-2 to answer the following questions:
-Which area of the graph shows when membrane potential approaches the potassium equilibrium potential?

Accepted Answer

A)   1
B)   2
C)   3
D)   4

Question 20

Sensory information from skeletal muscles travels over ________ fibers.

Accepted Answer

A)   type A
B)   type B
C)   type C
D)   type D
E)   type E

Exam 12: Nervous Tissue

Sensory neurons of the PNS are

Correct AnswerverifiedShow Answer

Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -Which area of the graph shows when membrane potential approaches the potassium equilibrium potential?

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The ________ division of the nervous system carries motor commands to muscles and glands.

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________ line the brain ventricles and spinal canal.

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Small, wandering cells that engulf cell debris and pathogens in the CNS are called

Correct AnswerverifiedShow Answer

The presence of ________ dramatically increases the speed at which an action potential moves along an axon.

Correct AnswerverifiedShow Answer

Ions can move across the plasma membrane in which of the following ways?

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When pressure is applied to neural tissue, all of the following effects are possible except

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Which of the following is not involved in creating the resting membrane potential of a neuron?

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During repolarization of a neuron

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Figure 12-1 The Neuron Use Figure 12-1 to answer the following questions: -Identify the structure labeled "4."

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Which of the following is not a function of astrocytes?

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The ________ principle states that the size and speed of the action potential are independent of the stimulus strength.

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Which type of synapse is most common in the nervous system?

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In-Text Figure Based Questions -The axon hillock is a region between what two general regions of a neuron? (Figure 12-2)

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Sensory information from skeletal muscles travels over ________ fibers.

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________ are the most numerous type of neuron in the CNS.

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Type ________ fibers have the largest diameter axons.

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Which of the following is true about threshold for an action potential?

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Neurons that have one axon and one dendrite, with the soma in between, are called

Correct AnswerverifiedShow Answer

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