Question 1

What is the difference between a tic and a spasm?

Accepted Answer

A)   A tic is a spasm that can be controlled voluntarily.
B)   A tic is a strong and very painful spasm, especially of the leg and foot.
C)   A tic is caused by stretching or tearing of a muscle, while a spasm is just an involuntary contraction.
D)   A tic is caused by the inflammation of a tendon, while a spasm is just an involuntary contraction.
E)   A tic refers to achy muscles, usually due to overexercise, while a spasm is just an involuntary contraction.F) None of the above
G) A) and B)

Question 2

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) All of the above
G) A) and B)

Question 3

What supplies the energy for muscle contraction?

Accepted Answer

A)   actin
B)   myosin
C)   tropomyosin
D)   ATP
E)   Ca2+F) C) and E)
G) D) and E)

Question 4

Because the heart beats continuously,cardiac fibers never relax completely.

Accepted Answer

A) True 
 B)False

Question 5

What structure attaches a muscle to a bone?

Accepted Answer

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

Question 6

Muscles can only pull; they cannot push.

Accepted Answer

A) True 
 B)False

Question 7

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) B) and E)
G) All of the above

Question 8

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 9

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 1,000 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) A) and D)
G) B) and E) B

Question 10

List the functions of the skeletal muscles.

Accepted Answer

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

Question 11

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

Accepted Answer

A) True 
 B)False  False

Question 12

What does the word sarco mean?

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

What is happening during the latent period of a muscle twitch?

Accepted Answer

A)   The muscle relaxes and returns to its former length.
B)   Fresh ATP binds to the myosin, causing it to return to its resting position.
C)   ADP and phosphate are released, and the power stroke of the contraction occurs.
D)   The myosin-actin cross-bridges are broken and the sarcomere shortens.
E)   The neurotransmitter is diffusing across the synaptic cleft, causing an electrical signal in the muscle cell.F) A) and E)
G) B) and E)

Question 15

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

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) B) and C)

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

One motor unit obeys a principle called the all-or-none law.

Accepted Answer

A) True 
 B)False

Question 19

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 D)
G) A) and B)

Question 20

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) All of the above
G) B) and C) A

Exam 13: Muscular System

What is the difference between a tic and a spasm?

Correct AnswerverifiedShow Answer

What muscle works in a pair with the biceps brachii?

Correct AnswerverifiedShow Answer

What supplies the energy for muscle contraction?

Correct AnswerverifiedShow Answer

Because the heart beats continuously,cardiac fibers never relax completely.

Correct AnswerverifiedShow Answer

What structure attaches a muscle to a bone?

Correct AnswerverifiedShow Answer

Muscles can only pull; they cannot push.

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

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

Correct AnswerverifiedShow 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 1,000 muscle fibers?

Correct AnswerverifiedB

List the functions of the skeletal muscles.

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

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

Correct AnswerverifiedFalse

What does the word sarco mean?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is happening during the latent period of a muscle twitch?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

One motor unit obeys a principle called the all-or-none law.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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B

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

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False

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A