Question 1

Axons terminate in a series of fine extensions known as

Accepted Answer

A)  telodendria.
B)  terminals.
C)  collaterals.
D)  dendrites.
E)  synapses.

Question 2

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

Accepted Answer

The answer of The ________ principle states that the size...

Question 3

Figure 12-2 The Nerve Action Potential
Use Figure 12-2 to answer the following questions:
-What is occurring at the area labeled #4?

Accepted Answer

A)  An inhibitory stimulus has occurred.
B)  Chemically-gated potassium channels have opened.
C)  Excessive potassium has diffused out causing hyperpolarization.
D)  Sodium ions have been pumped out of the neuron.
E)  Excessive depolarization of the axon has occurred.

Question 4

Which of the following is not a function of the neuroglia?

Accepted Answer

A)  support
B)  memory
C)  secretion of cerebrospinal fluid
D)  maintenance of blood-brain barrier
E)  phagocytosis

Question 5

The neuroglial cells that participate in maintaining the blood-brain barrier are the

Accepted Answer

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

Question 6

The ________ division carries motor commands to muscles and glands.

Accepted Answer

The answer of The ________ division carries motor commands to...

Question 7

Which of the following is not a possible drug effect on synaptic function?

Accepted Answer

A)  interfere with neurotransmitter synthesis
B)  interfere with neurotransmitter reuptake
C)  prevent neurotransmitter inactivation
D)  block neurotransmitter binding to receptors
E)  change the type of receptor found in the postsynaptic membrane

Question 8

________ provide information about the external environment.(Note: Be sure to capitalize the first letter of your answer).

Accepted Answer

The answer of ________ provide information about the external environment.(Note:...

Question 9

Puffer fish poison blocks voltage-gated sodium channels like a cork.What effect would this neurotoxin have on the function of neurons?

Accepted Answer

A)  Neurons would depolarize more rapidly.
B)  Action potentials would lack a repolarization phase.
C)  The absolute refractory period would be shorter than normal.
D)  The axon would be unable to generate action potentials.
E)  None,because the chemically-gated sodium channels would still function.

Question 10

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

Accepted Answer

A)  sense the internal and external environments
B)  integrate sensory information
C)  coordinate voluntary and involuntary activities
D)  direct long-term functions,such as growth
E)  control peripheral effectors

Question 11

Figure 12-1 The Neuron
Use Figure 12-1 to answer the following questions:
-Identify the structure labeled "5."

Accepted Answer

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

Question 12

The tiny gaps between adjacent Schwann cells are called ________.

Accepted Answer

The answer of The tiny gaps between adjacent Schwann cells...

Question 13

Many medications introduced into the bloodstream cannot directly affect the neurons of the CNS because

Accepted Answer

A)  oligodendrocytes form a continuous myelin sheath around the axons.
B)  the endothelium of CNS capillaries forms a blood-brain barrier.
C)  the neurolemma is impermeable to most molecules.
D)  ependymal cells restrict the flow of interstitial fluid between the capillaries and the neurons.
E)  astrocytes form a capsule around neurons.

Question 14

The effect that a neurotransmitter has on the postsynaptic membrane depends on

Accepted Answer

A)  the frequency of neurotransmitter release.
B)  the nature of the neurotransmitter.
C)  the characteristics of the receptors.
D)  the quantity of neurotransmitters released.
E)  All of the answers are correct.

Question 15

The all-or-none principle states that

Accepted Answer

A)  all stimuli will produce identical action potentials.
B)  all stimuli great enough to bring the membrane to threshold will produce identical action potentials.
C)  the greater the magnitude of the stimuli,the greater the magnitude of the action potential.
D)  only sensory stimuli can activate action potentials.
E)  only motor stimuli can activate action potentials.

Question 16

If the axolemma becomes more permeable to potassium ion:

Accepted Answer

A)  the membrane will depolarize to threshold
B)  a stronger stimulus will be required to cause an action potential
C)  the membrane will depolarize to +30 mV
D)  sodium ions will enter the cell to replace the lost potassium ions
E)  the inside of the membrane will have a positive charge

Question 17

Most CNS neurons lack centrioles.This observation explains

Accepted Answer

A)  why CNS neurons grow such long axons.
B)  why CNS neurons cannot divide to regenerate damaged tissue.
C)  the ability of neurons to generate an action potential.
D)  the ability of neurons to communicate with each other.
E)  the ability of neurons to produce a resting potential.

Question 18

________ are nerves that connect to the spinal cord.(Note: Be sure to capitalize the first letter of your answer).

Accepted Answer

The answer of ________ are nerves that connect to the...

Question 19

Glial cells that surround the neurons in ganglia are

Accepted Answer

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

Question 20

Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called

Accepted Answer

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

Exam 12: Neural Tissue

________ are nerves that connect to the spinal cord.(Note: Be sure to capitalize the first letter of your answer).

Correct AnswerverifiedShow Answer

Figure 12-1 The Neuron Use Figure 12-1 to answer the following questions: -Identify the structure labeled "5."

Correct AnswerverifiedShow Answer

________ provide information about the external environment.(Note: Be sure to capitalize the first letter of your answer).

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If the axolemma becomes more permeable to potassium ion:

Correct AnswerverifiedShow Answer

The all-or-none principle states that

Correct AnswerverifiedShow Answer

Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -What is occurring at the area labeled #4?

Correct AnswerverifiedShow Answer

Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called

Correct AnswerverifiedShow Answer

The neuroglial cells that participate in maintaining the blood-brain barrier are the

Correct AnswerverifiedShow Answer

The ________ division carries motor commands to muscles and glands.

Correct AnswerverifiedShow Answer

Axons terminate in a series of fine extensions known as

Correct AnswerverifiedShow Answer

The effect that a neurotransmitter has on the postsynaptic membrane depends on

Correct AnswerverifiedShow Answer

Many medications introduced into the bloodstream cannot directly affect the neurons of the CNS because

Correct AnswerverifiedShow Answer

Glial cells that surround the neurons in ganglia are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The tiny gaps between adjacent Schwann cells are called ________.

Correct AnswerverifiedShow Answer

Which of the following is not a function of the neuroglia?

Correct AnswerverifiedShow Answer

Which of the following is not a possible drug effect on synaptic function?

Correct AnswerverifiedShow Answer

Puffer fish poison blocks voltage-gated sodium channels like a cork.What effect would this neurotoxin have on the function of neurons?

Correct AnswerverifiedShow Answer

Most CNS neurons lack centrioles.This observation explains

Correct AnswerverifiedShow Answer

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