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

Which of the following is not an energy source for muscle contraction?

Accepted Answer

A)   glycogen
B)   triglycerides
C)   glucose
D)   fatty acids
E)   starchF) A) and B)
G) D) and E)

Question 3

Which of the following is not a function of skeletal muscles?

Accepted Answer

A)   pumping of blood throughout the body
B)   support
C)   movement of bones
D)   maintenance of body temperature
E)   protection of internal organsF) All of the above
G) A) and B)

Question 4

Why are slow-twitch muscles dark?

Accepted Answer

A)   They have many more myofibrils per motor unit than fast-twitch fibers.
B)   They are designed for strength and explosions of energy.
C)   They need less blood than fast-twitch fibers.
D)   They contain myoglobin.
E)   They have fewer mitochondria.F) B) and D)
G) C) and D)

Question 5

What is the name of the muscle that is responsible for blinking and winking?

Accepted Answer

A)   latissimus dorsi
B)   trapezius
C)   pectoralis major
D)   orbicularis oculi
E)   extensor digitorumF) B) and E)
G) A) and B)

Question 6

Of the three types of muscle tissue, which is not striated?

Accepted Answer

A)   smooth muscle
B)   cardiac muscle
C)   skeletal muscle
D)   skeletal and smooth lack striations
E)   cardiac and smooth lack striationsF) None of the above
G) A) and C)

Question 7

List the functions of the skeletal muscles.

Accepted Answer

1. Support of the body.
2. Movement of t...

Question 8

What does the word sarco mean?

Accepted Answer

A)   large
B)   short
C)   muscle
D)   tubule
E)   smoothF) A) and E)
G) A) and D)

Question 9

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) D) and E)
G) B) and C)

Question 10

What does the word brevis mean when referring to a muscle?

Accepted Answer

A)   large
B)   small
C)   huge
D)   long
E)   shortF) B) and C)
G) All of the above

Question 11

The origin of a muscle is on a stationary bone.

Accepted Answer

A) True 
 B)False

Question 12

Why is the innervation ratio in the ocular muscles one motor axon per 23 muscle fibers, whereas in the gastrocnemius muscle it is one motor axon per 1000 muscle fibers?

Accepted Answer

A)   There are more nerves in the upper body than in the lower extremities.
B)   The ocular muscles require finer control than moving the legs.
C)   The innervation ratio has to do with the overall size of the muscle--the bigger the muscle, the fewer the muscle fibers per motor axon.
D)   The gastrocnemius muscle contracts much harder than the ocular muscles do.
E)   There are fewer muscle fibers in the gastrocnemius muscle than in the ocular muscles.F) All of the above
G) A) and C)

Question 13

Which of the following is not a phase of a single muscle twitch?

Accepted Answer

A)   stimulation period
B)   latent period
C)   contraction period
D)   relaxation period
E)   none of these are phases of a muscle twitchF) A) and D)
G) B) and C)

Question 14

Of the three types of muscle tissue, which has multinucleated fibers?

Accepted Answer

A)   smooth muscle
B)   cardiac muscle
C)   skeletal muscle
D)   both smooth and skeletal muscles
E)   both cardiac and smooth musclesF) A) and E)
G) A) and D)

Question 15

Which disease is an autoimmune disease characterized by weakness that especially affects the muscles of the eyelids, face, neck, and extremities?

Accepted Answer

A)   myalgia
B)   muscular dystrophy
C)   myasthenia gravis
D)   tendinitis
E)   bursitisF) A) and E)
G) B) and D)

Question 16

Which of the following does not occur when you are very, very cold?

Accepted Answer

A)   More blood flows to the surface of the body.
B)   Smooth muscle contracts inside the blood vessels supplying the skin.
C)   The arrector pili muscles contract.
D)   Shivering occurs.
E)   You get goose bumps.F) A) and D)
G) None of the above

Question 17

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 lengthensF) A) and D)
G) B) and E)

Question 18

What is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma?

Accepted Answer

A)   T tubule
B)   sliding filament
C)   synaptic cleft
D)   synaptic vesicle
E)   sarcoplasmic reticulumF) A) and E)
G) A) and B)

Question 19

If you lock your knees while standing you may pass out because of the lack of venous return to the heart.

Accepted Answer

A) True 
 B)False

Question 20

Leiomyomas are a type of smooth muscle cancer that occurs in the uterine wall.

Accepted Answer

A) True 
 B)False

Exam 12: Muscular System

Why are slow-twitch muscles dark?

Correct AnswerverifiedShow Answer

What is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma?

Correct AnswerverifiedShow Answer

Which of the following does not occur when you are very, very cold?

Correct AnswerverifiedShow Answer

Which disease is an autoimmune disease characterized by weakness that especially affects the muscles of the eyelids, face, neck, and extremities?

Correct AnswerverifiedShow Answer

List the functions of the skeletal muscles.

Correct Answerverified1. Support of the body.2. Movement of t...View AnswerShow Answer

Why is the innervation ratio in the ocular muscles one motor axon per 23 muscle fibers, whereas in the gastrocnemius muscle it is one motor axon per 1000 muscle fibers?

Correct AnswerverifiedShow Answer

What does the word sarco mean?

Correct AnswerverifiedShow Answer

Leiomyomas are a type of smooth muscle cancer that occurs in the uterine wall.

Correct AnswerverifiedShow Answer

If you lock your knees while standing you may pass out because of the lack of venous return to the heart.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Of the three types of muscle tissue, which is not striated?

Correct AnswerverifiedShow Answer

Which of the following is not a function of skeletal muscles?

Correct AnswerverifiedShow Answer

Of the three types of muscle tissue, which has multinucleated fibers?

Correct AnswerverifiedShow Answer

Which of the following is not an energy source for muscle contraction?

Correct AnswerverifiedShow Answer

What is the name of the muscle that is responsible for blinking and winking?

Correct AnswerverifiedShow Answer

Which of the following is not a phase of a single muscle twitch?

Correct AnswerverifiedShow Answer

The origin of a muscle is on a stationary bone.

Correct AnswerverifiedShow Answer

What does the word brevis mean when referring to a muscle?

Correct AnswerverifiedShow Answer

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1. Support of the body.
2. Movement of t...
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