Question 1

Binding sites on the surface of actin allow the formation of cross-bridges with molecules of

Accepted Answer

A)   ATP.
B)   myosin.
C)   troponin.
D)   tropomyosin.E) A) and B)
F) A) and D)

Question 2

In the initiation of muscle fiber contraction, calcium ions bind to tropomyosin, exposing active sites on actin for cross-bridge formation.

Accepted Answer

A) True 
 B)False

Question 3

ATP is necessary for muscle relaxation.

Accepted Answer

A) True 
 B)False

Question 4

The rhythmic, wavelike motion produced by smooth muscles in tubular visceral organs is called _______.

Accepted Answer

The answer of The rhythmic, wavelike motion produced by smooth...

Question 5

The muscle that adducts and flexes the arm is the

Accepted Answer

A)   coracobrachialis.
B)   pectoralis minor.
C)   levator scapulae.
D)   teres major.E) B) and C)
F) A) and B)

Question 6

The outermost layer of connective tissue surrounding a skeletal muscle is the

Accepted Answer

A)   epimysium.
B)   perimysium.
C)   endomysium.
D)   sarcomysium.E) A) and D)
F) None of the above

Question 7

The toxin that causes botulism

Accepted Answer

A)   prevents release of acetylcholine.
B)   promotes release of acetylcholine.
C)   decomposes acetylcholine.
D)   prevents decomposition of acetylcholine.E) C) and D)
F) A) and C)

Question 8

Muscle atrophy that progresses with aging is caused by reduction in

Accepted Answer

A)   ATP.
B)   myoglobin.
C)   the sizes of muscle fibers.
D)   all of the above.E) None of the above
F) B) and C)

Question 9

Transverse tubules and sarcoplasmic reticulum are well developed in

Accepted Answer

A)   smooth muscle fibers.
B)   skeletal muscle fibers.
C)   cardiac muscle fibers.
D)   skeletal and cardiac muscle fibers.E) A) and B)
F) None of the above

Question 10

A sarcomere is best described as

Accepted Answer

A)   a part of the sarcoplasmic reticulum.
B)   a group of fascicles.
C)   a group of muscle fibers.
D)   a unit within a muscle fiber.E) A) and C)
F) C) and D)

Question 11

Endomysium separates individual muscle fibers from each other.

Accepted Answer

A) True 
 B)False

Question 12

A plank position is part of a yoga/Pilates workout. The person supports the body on the floor in a prone position with the arms and feet supporting the body. It is a little like the "up" position of a push-up, held for 30 to 60 seconds. Contraction of the abdominal muscles in a plank is most likely

Accepted Answer

A)   isotonic.
B)   eccentric.
C)   isometric.
D)   concentric.E) A) and B)
F) B) and D)

Question 13

A forceful, sustained muscle contraction is called a ______ ______.

Accepted Answer

The answer of A forceful, sustained muscle contraction is called...

Question 14

A motor neuron and the muscle fibers that it controls constitute a motor unit.

Accepted Answer

A) True 
 B)False

Question 15

When ATP levels are low, the relationship between ATP and creatine phosphate is that

Accepted Answer

A)   ATP supplies energy to synthesize creatine phosphate from creatine and phosphate.
B)   creatine phosphate supplies energy to regenerate ATP from ADP and phosphate.
C)   both have three phosphate groups.
D)   both are required to stimulate a muscle to contract.E) All of the above
F) B) and C)

Question 16

Fibers of muscles whose motor neurons are severed

Accepted Answer

A)   hypertrophy.
B)   may be replaced by fat or fibrous connective tissue.
C)   cannot ever be reinnervated.
D)   die as their sarcomeres are progressively eliminated.E) C) and D)
F) B) and C)

Question 17

Temporomandibular joint (TMJ)  syndrome causes

Accepted Answer

A)   headache.
B)   ringing in the ears.
C)   clicking sound from the jaw.
D)   all of the above.E) A) and B)
F) A) and C)

Question 18

Muscle fibers are basically a collection of

Accepted Answer

A)   muscles.
B)   sarcomeres.
C)   connective tissue fibers.
D)   synapses.E) A) and B)
F) A) and C)

Question 19

In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the

Accepted Answer

A)   refractory period.
B)   relaxation period.
C)   latent period.
D)   contraction period.E) B) and D)
F) B) and C)

Question 20

Which of the following is not true?

Accepted Answer

A)   Red fibers contract more slowly than white.
B)   Red fibers contain more myoglobin than white.
C)   Red fibers have fewer mitochondria than white.
D)   Red fibers fatigue more slowly than white.E) All of the above
F) B) and D)

Exam 9: Muscular System

The rhythmic, wavelike motion produced by smooth muscles in tubular visceral organs is called _______.

Correct AnswerverifiedShow Answer

A forceful, sustained muscle contraction is called a ______ ______.

Correct AnswerverifiedShow Answer

Transverse tubules and sarcoplasmic reticulum are well developed in

Correct AnswerverifiedShow Answer

A sarcomere is best described as

Correct AnswerverifiedShow Answer

A motor neuron and the muscle fibers that it controls constitute a motor unit.

Correct AnswerverifiedShow Answer

Endomysium separates individual muscle fibers from each other.

Correct AnswerverifiedShow Answer

In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the

Correct AnswerverifiedShow Answer

When ATP levels are low, the relationship between ATP and creatine phosphate is that

Correct AnswerverifiedShow Answer

The toxin that causes botulism

Correct AnswerverifiedShow Answer

Muscle fibers are basically a collection of

Correct AnswerverifiedShow Answer

A plank position is part of a yoga/Pilates workout. The person supports the body on the floor in a prone position with the arms and feet supporting the body. It is a little like the "up" position of a push-up, held for 30 to 60 seconds. Contraction of the abdominal muscles in a plank is most likely

Correct AnswerverifiedShow Answer

The muscle that adducts and flexes the arm is the

Correct AnswerverifiedShow Answer

In the initiation of muscle fiber contraction, calcium ions bind to tropomyosin, exposing active sites on actin for cross-bridge formation.

Correct AnswerverifiedShow Answer

Binding sites on the surface of actin allow the formation of cross-bridges with molecules of

Correct AnswerverifiedShow Answer

Fibers of muscles whose motor neurons are severed

Correct AnswerverifiedShow Answer

The outermost layer of connective tissue surrounding a skeletal muscle is the

Correct AnswerverifiedShow Answer

ATP is necessary for muscle relaxation.

Correct AnswerverifiedShow Answer

Temporomandibular joint (TMJ) syndrome causes

Correct AnswerverifiedShow Answer

Which of the following is not true?

Correct AnswerverifiedShow Answer

Muscle atrophy that progresses with aging is caused by reduction in

Correct AnswerverifiedShow Answer

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A forceful, sustained muscle contraction is called a .

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