Question 1

The neurotransmitter that controls skeletal muscle contraction is

Accepted Answer

A)  beta endorphin.
B)  nitric oxide.
C)  acetylcholine.
D)  GABA.E) B) and C)
F) A) and B)

Question 2

Synaptic knobs are at the ends of

Accepted Answer

A)  axons.
B)  dendrites.
C)  cell bodies.
D)  neuroglia.E) All of the above
F) A) and B)

Question 3

Which of the following molecules is responsible for "runner's high," a good feeling that accompanies long-distance running?

Accepted Answer

A)  Endorphin
B)  Acetylcholine
C)  Epinephrine
D)  DopamineE) A) and B)
F) A) and C)

Question 4

Convergence refers to

Accepted Answer

A)  dendrites from neurons in different parts of the nervous system contacting the same neuron.
B)  axons from neurons in different parts of the nervous system contacting the same neuron.
C)  dendrites from the same neuron touching each other.
D)  a neuroglial cell that contacts many neurons.E) C) and D)
F) All of the above

Question 5

Every neuron has

Accepted Answer

A)  many axons.
B)  a cell body.
C)  myelin.
D)  a neurilemma.E) A) and D)
F) A) and B) B

Question 6

Myelin is composed largely of carbohydrates.

Accepted Answer

A) True 
 B)False

Question 7

Drugs that inhibit the enzyme monoamine oxidase

Accepted Answer

A)  allow increased activity of norepinephrine.
B)  decompose norepinephrine.
C)  decrease the activity of serotonin.
D)  decompose serotonin.E) All of the above
F) A) and C)

Question 8

The space between neurons is called the neuronal space.

Accepted Answer

A) True 
 B)False  False

Question 9

Most of the neurons in the brain and spinal cord are

Accepted Answer

A)  bipolar.
B)  unipolar
C)  multipolar.
D)  nonpolar.E) B) and C)
F) B) and D)

Question 10

Myelin is rich in ________.

Accepted Answer

A)  nucleic acids
B)  carbohydrates
C)  lipids
D)  saltsE) A) and B)
F) B) and C)

Question 11

Several nerve fibers converging onto one neuron amplifies impulses.

Accepted Answer

A) True 
 B)False

Question 12

Drugs that increase the actions of norepinephrine and/or serotonin by keeping them in synapses longer are most likely used to treat

Accepted Answer

A)  multiple sclerosis.
B)  Tay-Sachs disease.
C)  clinical depression.
D)  erectile dysfunction.E) B) and C)
F) C) and D)

Question 13

Viagra is a drug used to treat erectile dysfunction by dilating arteries in the penis. The neurotransmitter that Viagra affects is

Accepted Answer

A)  acetylcholine.
B)  nitric oxide.
C)  serotonin.
D)  histamine.E) A) and D)
F) All of the above B

Question 14

Neuropeptides that affect a neuron's response to other neurotransmitters are called ________.

Accepted Answer

The answer of Neuropeptides that affect a neuron's response to...

Question 15

A neuron branching from the spinal cord innervates a group of muscle fibers in the biceps brachii and stimulates them to contract. This neuron is part of the ________ pathway.

Accepted Answer

The answer of A neuron branching from the spinal cord...

Question 16

Drugs that decrease membrane permeability to sodium

Accepted Answer

A)  increase the amount of nerve impulses to/through an affected area.
B)  increase pain.
C)  lessen pain.
D)  make pain-signalling neurons more excitableE) None of the above
F) A) and C)

Question 17

The oculomotor nerve is a cranial nerve containing nerve fibers that innervate eye muscles and control eye movement. These fibers are examples of

Accepted Answer

A)  sensory neurons.
B)  interneurons.
C)  motor neurons.
D)  unipolar neurons.E) B) and D)
F) None of the above

Question 18

A neuron is exposed to a drug that completely blocks voltage-gated potassium channels, but has no effect on non-gated channels or the sodium-potassium pump. Which of the following describes the effect on action potential generation?

Accepted Answer

A)  Threshold will never be crossed, and therefore an action potential will never be generated.
B)  Repolarization will never occur after threshold is crossed and sodium will continue to flow into the neuron.
C)  Repolarization will still occur, but at an inefficiently slow rate.
D)  Resting potential would not be maintained, as potassium could not leak out of the neuron.E) C) and D)
F) B) and D)

Question 19

Saltatory conduction

Accepted Answer

A)  occurs only if the myelin sheath is continuous.
B)  occurs only if nodes of Ranvier are lacking.
C)  is faster than conduction on an unmyelinated fiber.
D)  is slower than conduction on an unmyelinated fiber.E) B) and C)
F) A) and D)

Question 20

A nerve is a single neuron that transmits impulses.

Accepted Answer

A) True 
 B)False

Exam 10: Nervous System I: Basic Structure and Function

The neurotransmitter that controls skeletal muscle contraction is

Correct AnswerverifiedShow Answer

Synaptic knobs are at the ends of

Correct AnswerverifiedShow Answer

Which of the following molecules is responsible for "runner's high," a good feeling that accompanies long-distance running?

Correct AnswerverifiedShow Answer

Convergence refers to

Correct AnswerverifiedShow Answer

Every neuron has

Correct AnswerverifiedB

Myelin is composed largely of carbohydrates.

Correct AnswerverifiedShow Answer

Drugs that inhibit the enzyme monoamine oxidase

Correct AnswerverifiedShow Answer

The space between neurons is called the neuronal space.

Correct AnswerverifiedFalse

Most of the neurons in the brain and spinal cord are

Correct AnswerverifiedShow Answer

Myelin is rich in ________.

Correct AnswerverifiedShow Answer

Several nerve fibers converging onto one neuron amplifies impulses.

Correct AnswerverifiedShow Answer

Drugs that increase the actions of norepinephrine and/or serotonin by keeping them in synapses longer are most likely used to treat

Correct AnswerverifiedShow Answer

Viagra is a drug used to treat erectile dysfunction by dilating arteries in the penis. The neurotransmitter that Viagra affects is

Correct AnswerverifiedB

Neuropeptides that affect a neuron's response to other neurotransmitters are called ________.

Correct AnswerverifiedShow Answer

A neuron branching from the spinal cord innervates a group of muscle fibers in the biceps brachii and stimulates them to contract. This neuron is part of the ________ pathway.

Correct AnswerverifiedShow Answer

Drugs that decrease membrane permeability to sodium

Correct AnswerverifiedShow Answer

The oculomotor nerve is a cranial nerve containing nerve fibers that innervate eye muscles and control eye movement. These fibers are examples of

Correct AnswerverifiedShow Answer

A neuron is exposed to a drug that completely blocks voltage-gated potassium channels, but has no effect on non-gated channels or the sodium-potassium pump. Which of the following describes the effect on action potential generation?

Correct AnswerverifiedShow Answer

Saltatory conduction

Correct AnswerverifiedShow Answer

A nerve is a single neuron that transmits impulses.

Correct AnswerverifiedShow Answer

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B

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False

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B

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