Question 1

What is found within the intercalated disks of cardiac muscle?

Accepted Answer

A)   sarcoplasmic reticulum
B)   gap junctions
C)   dense connective tissue
D)   bone
E)   myoglobinF) C) and D)
G) A) and E)

Question 2

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

Question 3

A muscle fiber is made up of many

Accepted Answer

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

Question 4

What is the name of a sudden and involuntary muscular contraction, often accompanied by pain?

Accepted Answer

A)   bursitis
B)   sprain
C)   strain
D)   tic
E)   spasmF) B) and E)
G) None of the above

Question 5

What is the biggest muscle (in terms of mass)  in the body?

Accepted Answer

A)   gluteus maximus
B)   sartorius
C)   stapedius
D)   quadriceps femoris
E)   latissimus dorsiF) A) and B)
G) A) and C)

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

When a muscle contracts, the H zone almost disappears.

Accepted Answer

A) True 
 B)False

Question 8

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 over exercise, while a spasm is just an involuntary contraction.F) C) and E)
G) A) and B)

Question 9

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 C)
G) B) and C)

Question 10

One motor neuron activates one muscle fiber.

Accepted Answer

A) True 
 B)False

Question 11

What ion is responsible for initiating muscle contraction?

Accepted Answer

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

Question 12

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

Question 13

Which of the following is not a source of ATP for muscle contraction?

Accepted Answer

A)   ATP in the blood
B)   ATP stored in the cell
C)   the creatine phosphate pathway
D)   fermentation
E)   aerobic respirationF) A) and C)
G) A) and B)

Question 14

One sarcomere

Accepted Answer

A)   extends from Z line to Z line.
B)   is composed of many myofibrils.
C)   contains only actin fibers.
D)   is composed of many muscle fibers.
E)   surrounds each muscle in the body.F) B) and D)
G) B) and C)

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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 E)
G) A) and D)

Question 17

Explain the structural differences between the thick and thin myofilaments.

Accepted Answer

Thick filaments are composed of several ...

Question 18

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

Question 19

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

Question 20

Several of the structures in the muscle cell are given special names. For example, the cytoplasm of a muscle fiber is called the sarcoplasm. Which of the following is truly a unique structure to muscle cells (not just a renamed one) ?

Accepted Answer

A)   cytoplasm
B)   nucleus
C)   endoplasmic reticulum
D)   transverse (T)  system
E)   plasma membraneF) D) and E)
G) B) and E)

Exam 12: Muscular System

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When a muscle contracts, the H zone almost disappears.

Correct AnswerverifiedShow Answer

One sarcomere

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the difference between a tic and a spasm?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What muscle works in a pair with the biceps brachii?

Correct AnswerverifiedShow Answer

Which of the following is not a source of ATP for muscle contraction?

Correct AnswerverifiedShow Answer

What is the name of a sudden and involuntary muscular contraction, often accompanied by pain?

Correct AnswerverifiedShow Answer

What is found within the intercalated disks of cardiac muscle?

Correct AnswerverifiedShow Answer

What ion is responsible for initiating muscle contraction?

Correct AnswerverifiedShow Answer

What is the biggest muscle (in terms of mass) in the body?

Correct AnswerverifiedShow Answer

Several of the structures in the muscle cell are given special names. For example, the cytoplasm of a muscle fiber is called the sarcoplasm. Which of the following is truly a unique structure to muscle cells (not just a renamed one) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

One motor neuron activates one muscle fiber.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Explain the structural differences between the thick and thin myofilaments.

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

Which way does the adductor longus move the thigh?

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A muscle fiber is made up of many

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Thick filaments are composed of several ...
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