Question 1

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 cell

Question 2

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 refractory

Question 3

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.

Question 4

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)   repolarization

Question 5

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 membrane

Question 6

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 innervates

Question 7

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 contractions

Exam 14: Skeletal Muscle Physiology: Frogs and Human Subjects

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

Correct Answer
verified

During an action potential in muscle, .

Correct Answer
verified

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

Correct Answer
verified

A motor unit is _ .

Correct Answer
verified

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

In your laboratory experiments, you most often observed .

Correct Answer
verified

Exam 14: Skeletal Muscle Physiology: Frogs and Human Subjects

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

Correct AnswerverifiedShow Answer

During an action potential in muscle, .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A motor unit is _ .

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

In your laboratory experiments, you most often observed .

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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