Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

What structure attaches a muscle to a bone?

Accepted Answer

A)   ligaments
B)   tendons
C)   bursae
D)   sarcolemma
E)   sarcoplasmF) B) and D)
G) A) and B)

Question 3

What muscle works in a pair with the biceps brachii?

Accepted Answer

A)   the triceps brachii
B)   the trapezius
C)   the masseter
D)   the pectoralis major
E)   the sartoriusF) A) and C)
G) D) and E) A

Question 4

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 B)
G) B) and C)

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

What does troponin bind to, and what happens when it binds?

Accepted Answer

A)   Ca2+; tropomyosin shifts
B)   tropomyosin; the sarcomere relaxes
C)   acetylcholine; the sarcomere shortens
D)   ATP; tropomyosin returns to normal position
E)   T tubules; the sarcomere shortensF) A) and E)
G) C) and E)

Question 7

From the outside of a muscle coming in, the first thing encountered would be

Accepted Answer

A)   fascia.
B)   fascicle.
C)   dense connective tissue.
D)   muscle fiber.
E)   myofibril.F) C) and D)
G) A) and B)

Question 8

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) None of the above
G) C) and D)

Question 9

Fibromyalgia is a temporary condition of achy muscles, usually due to overuse.

Accepted Answer

A) True 
 B)False

Question 10

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 D)
G) A) and C)

Question 11

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) B) and D)
G) A) and C)

Question 12

List the functions of the skeletal muscles.

Accepted Answer

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

Question 13

Explain the structural differences between the thick and thin myofilaments.

Accepted Answer

A THICK FILAMENT IS COMPOSED OF SEVERAL ...

Question 14

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) A) and B)
G) C) and D)

Question 15

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

Question 16

In good muscle tone, how many motor units are contracted?

Accepted Answer

A)   none
B)   some
C)   all
D)   5-10% of the motor units
E)   10-15% of the motor unitsF) A) and D)
G) C) and D)

Question 17

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  True

Question 18

What information does the word rectus give you about a muscle?

Accepted Answer

A)   the size of the muscle fibers
B)   the attachment of the muscle fibers
C)   the action of the muscle fibers
D)   the shape of the muscle fibers
E)   the direction of muscle fibersF) A) and D)
G) A) and C)

Question 19

When a muscle contracts, the H band almost disappears.

Accepted Answer

A) True 
 B)False  True

Question 20

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 twitch.F) D) and E)
G) B) and D)

Exam 13: Muscular System

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

Correct AnswerverifiedShow Answer

What structure attaches a muscle to a bone?

Correct AnswerverifiedShow Answer

What muscle works in a pair with the biceps brachii?

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What does troponin bind to, and what happens when it binds?

Correct AnswerverifiedShow Answer

From the outside of a muscle coming in, the first thing encountered would be

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

Fibromyalgia is a temporary condition of achy muscles, usually due to overuse.

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

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

Correct AnswerverifiedShow Answer

List the functions of the skeletal muscles.

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

Explain the structural differences between the thick and thin myofilaments.

Correct AnswerverifiedA THICK FILAMENT IS COMPOSED OF SEVERAL ...View AnswerShow Answer

Why are slow-twitch muscles dark?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In good muscle tone, how many motor units are contracted?

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 AnswerverifiedTrue

What information does the word rectus give you about a muscle?

Correct AnswerverifiedShow Answer

When a muscle contracts, the H band almost disappears.

Correct AnswerverifiedTrue

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

Correct AnswerverifiedShow Answer

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

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A THICK FILAMENT IS COMPOSED OF SEVERAL ...
View Answer

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True

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True

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