Question 1

Jillian is a top-level cross-country runner due to her having predominantly slow-twitch muscle fibers.

Accepted Answer

A) True 
 B)False

Question 2

What ion is responsible for initiating muscle contraction?

Accepted Answer

A)   Mg2+
B)   Ca2+
C)   H+
D)   Cl-
E)   Na+F) None of the above
G) All of the above

Question 3

Which of the following injuries is most likely to happen to the ankle?

Accepted Answer

A)   sprain
B)   strain
C)   convulsion
D)   bursitis
E)   muscular dystrophyF) A) and E)
G) D) and E)

Question 4

Temperature-sensitive neurons in the skin are responsible for initiating shivering.

Accepted Answer

A) True 
 B)False

Question 5

Which way does the adductor longus move the thigh?

Accepted Answer

A)   away from the midline
B)   toward the midline
C)   in a circle
D)   in a cone
E)   towards the backF) A) and B)
G) A) and C)

Question 6

Each actin molecule is shaped like a golf club,with a straight portion ending in a globular head.

Accepted Answer

A) True 
 B)False

Question 7

One motor neuron activates one muscle fiber.

Accepted Answer

A) True 
 B)False

Question 8

The origin of a muscle is on a stationary bone.

Accepted Answer

A) True 
 B)False

Question 9

What happens to the actin and myosin filaments when a muscle contracts?

Accepted Answer

A)   Both of them shorten.
B)   Both of them lengthen.
C)   Both stay the same length.
D)   Actin shortens, while myosin lengthens.
E)   Myosin shortens, while actin lengthens.F) A) and B)
G) A) and C)

Question 10

When the nerve signal reaches the axon terminal,what happens next?

Accepted Answer

A)   The muscle contracts.
B)   The synaptic vesicles release neurotransmitter.
C)   An electrical signal is formed that jumps the synaptic cleft.
D)   H+ is pumped into the synaptic cleft.
E)   Myosin is released from the axon terminal.F) A) and E)
G) B) and E)

Question 11

Skeletal muscle contractions play a role in returning the venous blood to the heart.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following does not attach to the sternocleidomastoid muscle?

Accepted Answer

A)   rib
B)   clavicle
C)   sternum
D)   mastoid process
E)   skullF) A) and D)
G) C) and E)

Question 13

Of the three pathways for supplying ATP to the muscle,which pathway(s) do slow-twitch fibers prefer?

Accepted Answer

A)   the creatine phosphate pathway
B)   fermentation
C)   aerobic respiration
D)   the creatine phosphate pathway or fermentation
E)   the creatine phosphate pathway or aerobic respirationF) B) and E)
G) C) and D)

Question 14

What is the reservoir for Ca2+ in the body?

Accepted Answer

A)   muscles
B)   bones
C)   liver
D)   brain
E)   bloodF) A) and C)
G) All of the above

Question 15

Which muscle injury is characterized by a twisting of a joint leading to swelling and injury?

Accepted Answer

A)   sprain
B)   strain
C)   tendinitis
D)   bursitis
E)   myalgiaF) A) and E)
G) A) and D)

Question 16

Explain the differences between fast-twitch and slow-twitch muscle fibers.

Accepted Answer

Fast-twitch muscle fibers are usually an...

Question 17

Which of the following does not occur when a muscle fatigues?

Accepted Answer

A)   Its energy reserves are depleted.
B)   Stimulation continues.
C)   Tetanus is achieved.
D)   Acetylcholine is crossing the synaptic cleft.
E)   The muscle relaxes.F) All of the above
G) C) and D)

Question 18

Contraction of a muscle requires all the motor units to be undergoing tetanic contraction.

Accepted Answer

A) True 
 B)False

Question 19

What do smooth,cardiac,and skeletal muscle all have in common?

Accepted Answer

A)   They are all uninucleated.
B)   They are all striated.
C)   They are all found in the walls of blood vessels.
D)   The cells of these muscles are all called muscle fibers.
E)   They all interlock at intercalated disks.F) All of the above
G) A) and B)

Question 20

A muscle fiber is made up of many

Accepted Answer

A)   muscle cells.
B)   T tubules.
C)   myofibrils.
D)   fascicles.
E)   bursa.F) C) and D)
G) A) and B)

Exam 13: Muscular System

The origin of a muscle is on a stationary bone.

Correct AnswerverifiedShow Answer

What do smooth,cardiac,and skeletal muscle all have in common?

Correct AnswerverifiedShow Answer

Skeletal muscle contractions play a role in returning the venous blood to the heart.

Correct AnswerverifiedShow Answer

Jillian is a top-level cross-country runner due to her having predominantly slow-twitch muscle fibers.

Correct AnswerverifiedShow Answer

What ion is responsible for initiating muscle contraction?

Correct AnswerverifiedShow Answer

When the nerve signal reaches the axon terminal,what happens next?

Correct AnswerverifiedShow Answer

What is the reservoir for Ca2+ in the body?

Correct AnswerverifiedShow Answer

Temperature-sensitive neurons in the skin are responsible for initiating shivering.

Correct AnswerverifiedShow Answer

Contraction of a muscle requires all the motor units to be undergoing tetanic contraction.

Correct AnswerverifiedShow Answer

Each actin molecule is shaped like a golf club,with a straight portion ending in a globular head.

Correct AnswerverifiedShow Answer

Explain the differences between fast-twitch and slow-twitch muscle fibers.

Correct AnswerverifiedFast-twitch muscle fibers are usually an...View AnswerShow Answer

Which of the following does not attach to the sternocleidomastoid muscle?

Correct AnswerverifiedShow Answer

A muscle fiber is made up of many

Correct AnswerverifiedShow Answer

Which of the following injuries is most likely to happen to the ankle?

Correct AnswerverifiedShow Answer

One motor neuron activates one muscle fiber.

Correct AnswerverifiedShow Answer

Which of the following does not occur when a muscle fatigues?

Correct AnswerverifiedShow Answer

Of the three pathways for supplying ATP to the muscle,which pathway(s) do slow-twitch fibers prefer?

Correct AnswerverifiedShow Answer

Which muscle injury is characterized by a twisting of a joint leading to swelling and injury?

Correct AnswerverifiedShow Answer

What happens to the actin and myosin filaments when a muscle contracts?

Correct AnswerverifiedShow Answer

Which way does the adductor longus move the thigh?

Correct AnswerverifiedShow Answer

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What is the reservoir for Ca²⁺ in the body?

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Fast-twitch muscle fibers are usually an...
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