Question 1

How do the muscles of a sprinter running the 400-yard dash in 50 seconds receive most of their energy?

Accepted Answer

A)   The aerobic respiration of fatty acids
B)   The breakdown of creatine phosphate
C)   The anaerobic respiration of glucose
D)   The aerobic respiration of glucoseE) None of the above
F) A) and D)

Question 2

The continuous state of partial contraction that allows you to stand and hold your head up is called ____________________.

Accepted Answer

The answer of The continuous state of partial contraction that...

Question 3

In an ____________________ contraction,the muscle changes length to move a load whereas the tension in the muscle remains the same.

Accepted Answer

The answer of In an ____________________ contraction,the muscle changes length...

Question 4

The plasma membrane that surrounds a muscle fiber is called a ____________________.

Accepted Answer

The answer of The plasma membrane that surrounds a muscle...

Question 5

Besides ATP,muscle contraction requires

Accepted Answer

A)   sodium.
B)   potassium.
C)   calcium.
D)   tropomyosin and troponin.E) C) and D)
F) B) and C)

Question 6

When extending the forearm

Accepted Answer

A)   the triceps brachii is the prime mover,and the brachialis is the synergist.
B)   the triceps brachii is the synergist,and the brachialis is the prime mover.
C)   the triceps brachii is the prime mover,and the brachialis is the antagonist.
D)   the triceps brachii is the antagonist,and the brachialis is the prime mover.E) A) and B)
F) B) and C)

Question 7

What are myofibrils?

Accepted Answer

A)   Long protein bundles that fill the sarcoplasm and store glycogen
B)   The membrane surrounding each muscle fiber
C)   Tubules that allow electrical impulses to travel into the muscle cell
D)   Another name for muscle cellsE) A) and B)
F) All of the above

Question 8

What are the units of contraction in a muscle called?

Accepted Answer

A)   Myofilaments
B)   Z lines
C)   Sarcomeres
D)   SarcolemmasE) A) and C)
F) None of the above

Question 9

The minimum voltage needed to cause a muscle fiber to contract is called the ____________________.

Accepted Answer

The answer of The minimum voltage needed to cause a...

Question 10

A lack of use causes a muscle to shrink,or ____________________.

Accepted Answer

The answer of A lack of use causes a muscle...

Question 11

A skeletal muscle cell is called a ____________________.

Accepted Answer

The answer of A skeletal muscle cell is called a...

Question 12

How does muscle attach to muscle?

Accepted Answer

A)   Muscle fibers of one muscle merge with the fibers of the other muscle.
B)   The epimysium extends past the muscle and merges with the epimysium of the other muscle.
C)   The epimysium extends past the muscle as a flat sheet of connective tissue that fuses with the covering of the other muscle.
D)   Muscle does not attach to muscle; it only attaches to bone.E) C) and D)
F) None of the above

Question 13

According to the sliding-filament model of contraction,how does muscle contraction occur?

Accepted Answer

A)   The myosin heads propel the actin myofilaments toward the center of the sarcomere; this pulls the Z disks closer together,which shortens the sarcomere and the entire muscle.
B)   The actin heads propel the myosin filaments toward the center of the sarcomere; this pulls the Z disks closer together,which shortens the sarcomere and the entire muscle.
C)   The myosin heads propel the actin myofilaments toward the center of the sarcomere.This causes the myofilaments to shorten,which pulls the Z disks closer together to shorten the sarcomere and the entire muscle.
D)   Both the actin and myosin myofilaments shorten,which shrinks the sarcomere and pulls the Z disks closer together.As the Z disks move closer together,the muscle contracts.E) None of the above
F) A) and B)

Exam 9: Muscular System

How do the muscles of a sprinter running the 400-yard dash in 50 seconds receive most of their energy?

Correct Answer
verified

Besides ATP,muscle contraction requires

Correct Answer
verified

What are the units of contraction in a muscle called?

Correct Answer
verified

The minimum voltage needed to cause a muscle fiber to contract is called the ____________________.

Correct Answer
verified

According to the sliding-filament model of contraction,how does muscle contraction occur?

Correct Answer
verified

What are myofibrils?

Correct Answer
verified

A lack of use causes a muscle to shrink,or ____________________.

Correct Answer
verified

The continuous state of partial contraction that allows you to stand and hold your head up is called ____________________.

Correct Answer
verified

In an ____________________ contraction,the muscle changes length to move a load whereas the tension in the muscle remains the same.

Correct Answer
verified

The plasma membrane that surrounds a muscle fiber is called a ____________________.

Correct Answer
verified

When extending the forearm

Correct Answer
verified

A skeletal muscle cell is called a ____________________.

Correct Answer
verified

How does muscle attach to muscle?

Correct Answer
verified

Exam 9: Muscular System

How do the muscles of a sprinter running the 400-yard dash in 50 seconds receive most of their energy?

Correct AnswerverifiedShow Answer

Besides ATP,muscle contraction requires

Correct AnswerverifiedShow Answer

What are the units of contraction in a muscle called?

Correct AnswerverifiedShow Answer

The minimum voltage needed to cause a muscle fiber to contract is called the ____________________.

Correct AnswerverifiedShow Answer

According to the sliding-filament model of contraction,how does muscle contraction occur?

Correct AnswerverifiedShow Answer

What are myofibrils?

Correct AnswerverifiedShow Answer

A lack of use causes a muscle to shrink,or ____________________.

Correct AnswerverifiedShow Answer

The continuous state of partial contraction that allows you to stand and hold your head up is called ____________________.

Correct AnswerverifiedShow Answer

In an ____________________ contraction,the muscle changes length to move a load whereas the tension in the muscle remains the same.

Correct AnswerverifiedShow Answer

The plasma membrane that surrounds a muscle fiber is called a ____________________.

Correct AnswerverifiedShow Answer

When extending the forearm

Correct AnswerverifiedShow Answer

A skeletal muscle cell is called a ____________________.

Correct AnswerverifiedShow Answer

How does muscle attach to muscle?

Correct AnswerverifiedShow Answer

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