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)  myoglobin 
A)  sarcoplasmic reticulum 
B)  gap junctions 
C)  dense connective tissue 
D)  bone 
E)  myoglobin

Question 2

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

Question 3

Explain the structural differences between the thick and thin myofilaments.

Accepted Answer

Thick filaments are composed of several

Question 4

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

Question 5

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 sartorius 
A)  the triceps brachii 
B)  the trapezius 
C)  the masseter 
D)  the pectoralis major 
E)  the sartorius

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 sarcome shortens 
D)  ATP, tropomyosin returns to normal position 
E)  T tubules, the sarcomere shortens 
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 shortens

Question 7

When a muscle contracts, the H zone almost disappears.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

What ion is responsible for initiating muscle contraction?

Accepted Answer

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

Question 10

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. 
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.

Question 11

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)  spasm 
A)  bursitis 
B)  sprain 
C)  strain 
D)  tic 
E)  spasm

Question 12

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. 
A)  Its energy reserves are depleted. 
B)  Stimulation continues. 
C)  Tetanus is achieved. 
D)  Acetylcholine is crossing the synaptic cleft. 
E)  The muscle relaxes.

Question 13

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 membrane 
A)  cytoplasm 
B)  nucleus 
C)  endoplasmic reticulum 
D)  transverse (T) system 
E)  plasma membrane

Question 14

One motor neuron activates one muscle fiber.

Accepted Answer

A) True 
 B)False

Question 15

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 dorsi 
A)  gluteus maximus 
B)  sartorius 
C)  stapedius 
D)  quadriceps femoris 
E)  latissimus dorsi

Question 16

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)  origin 
A)  prime mover 
B)  synergists 
C)  antagonist 
D)  synergism 
E)  origin

Question 17

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. 
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.

Question 18

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 back 
A)  away from the midline 
B)  toward the midline 
C)  in a circle 
D)  in a cone 
E)  towards the back

Question 19

A muscle fiber is made up of many

Accepted Answer

A)  muscle cells. 
B)  T tubules. 
C)  myofibrils. 
D)  fascicles. 
E)  bursa. 
A)  muscle cells. 
B)  T tubules. 
C)  myofibrils. 
D)  fascicles. 
E)  bursa.

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 12: Muscular System

What is found within the intercalated disks of cardiac muscle?

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

Explain the structural differences between the thick and thin myofilaments.

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

What muscle works in a pair with the biceps brachii?

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

When a muscle contracts, the H zone almost disappears.

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

What ion is responsible for initiating muscle contraction?

What is the difference between a tic and a spasm?

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

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

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)?

One motor neuron activates one muscle fiber.

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

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

One sarcomere

Which way does the adductor longus move the thigh?

A muscle fiber is made up of many

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

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