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

Question 3

Muscles can only pull;they cannot push.

Accepted Answer

A) True 
 B)False

Question 4

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) A) and B)
G) A) and E)

Question 5

What ion is responsible for initiating muscle contraction?

Accepted Answer

A)  Mg2+
B)  Ca2+
C)  H+
D)  Cl-
E)  Na+F) A) and D)
G) B) and E)

Question 6

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

Accepted Answer

A)  large
B)  small
C)  huge
D)  long
E)  shortF) C) and E)
G) A) and B)

Question 7

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

Question 8

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

Question 9

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 E)
G) A) and B)

Question 10

Of the three pathways for obtaining ATP for muscle contraction,which one requires oxygen?

Accepted Answer

A)  only the creatine phosphate pathway
B)  only fermentation
C)  only respiration
D)  fermentation and respiration
E)  the creatine phosphate pathway and fermentationF) B) and E)
G) A) and B)

Question 11

What is the reservoir for Ca2+ in the body?

Accepted Answer

A)  muscles
B)  bones
C)  liver
D)  brain
E)  bloodF) D) and E)
G) A) and B)

Question 12

What does the word sarco mean?

Accepted Answer

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

Question 13

Explain the structural differences between the thick and thin myofilaments.

Accepted Answer

Thick filaments are composed of several ...

Question 14

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 B)
G) C) and D)

Question 15

What is the deltoid muscle shaped like?

Accepted Answer

A)  a long thin line
B)  a square
C)  a triangle
D)  a circle
E)  a trapezoidF) A) and C)
G) A) and B)

Question 16

One motor neuron activates one muscle fiber.

Accepted Answer

A) True 
 B)False

Question 17

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 sarcome shortens
D)  ATP,tropomyosin returns to normal position
E)  T tubules,the sarcomere shortensF) B) and E)
G) A) and D)

Question 18

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) B) and E)
G) A) and B)

Question 19

Which of the following is not a term that refers to how muscles work?

Accepted Answer

A)  prime mover
B)  synergists
C)  antagonist
D)  synergism
E)  originF) A) and D)
G) C) and D)

Question 20

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

Exam 13: Muscular System

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

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

Muscles can only pull;they cannot push.

Correct AnswerverifiedShow Answer

What does the word sarco mean?

Correct AnswerverifiedShow Answer

Which of the following is not a term that refers to how muscles work?

Correct AnswerverifiedShow Answer

What ion is responsible for initiating muscle contraction?

Correct AnswerverifiedShow Answer

Why are slow-twitch muscles dark?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Explain the structural differences between the thick and thin myofilaments.

Correct AnswerverifiedThick filaments are composed of several ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

What is the reservoir for Ca2+ in the body?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the deltoid muscle shaped like?

Correct AnswerverifiedShow Answer

One motor neuron activates one muscle fiber.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Of the three pathways for obtaining ATP for muscle contraction,which one requires oxygen?

Correct AnswerverifiedShow Answer

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Thick filaments are composed of several ...
View Answer

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What is the reservoir for Ca²⁺ in the body?

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