Question 1

When a muscle cell is at rest, there is a charge separation (voltage)  across the plasma membrane called .

Accepted Answer

A)   the resting membrane potential
B)   depolarization
C)   the battery
D)   repolarizationE) C) and D)
F) None of the above

Question 2

In your laboratory experiments, you most often observed .

Accepted Answer

A)   both isotonic and isometric contractions
B)   isometric contractions
C)   neither isotonic nor isometric contractions
D)   isotonic contractionsE) A) and C)
F) All of the above

Question 3

During the _ period in a muscle cell there is no possibility of generating another action potential.

Accepted Answer

A)   relaxation
B)   relative refractory
C)   contraction
D)   absolute refractoryE) A) and B)
F) A) and C)

Question 4

Place the following events in the correct sequence in which they occur: excitation-contraction coupling, electrical excitation of the muscle cell membrane, sliding of the myofilaments.

Accepted Answer

A)   sliding of the myofilaments, electrical excitation of the muscle cell membrane, excitation-contraction coupling
B)   electrical excitation of the muscle cell membrane, excitation-contraction coupling, sliding of the myofilaments
C)   electrical excitation of the muscle cell membrane, sliding of the myofilaments, excitation-contraction coupling
D)   excitation-contraction coupling, sliding of myofilaments, electrical excitation of the muscle cell membraneE) C) and D)
F) A) and B)

Question 5

During an action potential in muscle, .

Accepted Answer

A)   both Na+ and K+ diffuse out of the cell
B)   Na+ diffuses into the cell, then K+ diffuses out
C)   K+ diffuses into the cell, then Na+ diffuses out
D)   both Na+ and K+ diffuse into the cellE) All of the above
F) B) and D)

Question 6

Your friend has a paralyzed arm. What physical events might have caused this?

Accepted Answer

A)   damage to the part of the spinal cord that controls that arm
B)   drug-induced failure at the neuromuscular junction
C)   damage to the part of the brain that controls that arm
D)   Any of these events could have caused the paralysis: damage to the part of the brain that controls that arm, damage to the part of the spinal cord that controls that arm, or drug-induced failure at the neuromuscular junction.E) A) and B)
F) B) and C)

Question 7

A motor unit is _ .

Accepted Answer

A)   a period of time during muscle contraction
B)   all the axons of nerve cells that innervate a muscle
C)   a group of linked muscle cells
D)   a single motor neuron and all the muscle cells it innervatesE) C) and D)
F) A) and D)

Exam 14: Skeletal Muscle Physiology: Frogs and Human Subjects

During an action potential in muscle, .

Correct Answer
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Place the following events in the correct sequence in which they occur: excitation-contraction coupling, electrical excitation of the muscle cell membrane, sliding of the myofilaments.

Correct Answer
verified

When a muscle cell is at rest, there is a charge separation (voltage) across the plasma membrane called .

Correct Answer
verified

A motor unit is _ .

Correct Answer
verified

Your friend has a paralyzed arm. What physical events might have caused this?

Correct Answer
verified

During the _ period in a muscle cell there is no possibility of generating another action potential.

Correct Answer
verified

In your laboratory experiments, you most often observed .

Correct Answer
verified

Exam 14: Skeletal Muscle Physiology: Frogs and Human Subjects

During an action potential in muscle, .

Correct AnswerverifiedShow Answer

Place the following events in the correct sequence in which they occur: excitation-contraction coupling, electrical excitation of the muscle cell membrane, sliding of the myofilaments.

Correct AnswerverifiedShow Answer

When a muscle cell is at rest, there is a charge separation (voltage) across the plasma membrane called .

Correct AnswerverifiedShow Answer

A motor unit is _ .

Correct AnswerverifiedShow Answer

Your friend has a paralyzed arm. What physical events might have caused this?

Correct AnswerverifiedShow Answer

During the _ period in a muscle cell there is no possibility of generating another action potential.

Correct AnswerverifiedShow Answer

In your laboratory experiments, you most often observed .

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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