Question 1

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 2

Explain the differences between fast-twitch and slow-twitch muscle fibers.

Accepted Answer

Fast-twitch muscle fibers are usually an

Question 3

What is the reservoir for Ca2+ in the body?

Accepted Answer

A)  muscles 
B)  bones 
C)  liver 
D)  brain 
E)  blood 
A)  muscles 
B)  bones 
C)  liver 
D)  brain 
E)  blood

Question 4

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 respiration 
A)  the creatine phosphate pathway 
B)  fermentation 
C)  aerobic respiration 
D)  the creatine phosphate pathway or fermentation 
E)  the creatine phosphate pathway or aerobic respiration

Question 5

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 6

Which of the following does not attach to the sternocleidomastoid muscle?

Accepted Answer

A)  rib 
B)  clavicle 
C)  sternum 
D)  mastoid process 
E)  skull 
A)  rib 
B)  clavicle 
C)  sternum 
D)  mastoid process 
E)  skull

Question 7

Temperature-sensitive neurons in the skin are responsible for initiating shivering.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

The origin of a muscle is on a stationary bone.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 12

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

Accepted Answer

A) True 
 B)False

Question 13

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. 
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.

Question 14

Which of the following injuries is most likely to happen to the ankle?

Accepted Answer

A)  sprain 
B)  strain 
C)  convulsion 
D)  bursitis 
E)  muscular dystrophy 
A)  sprain 
B)  strain 
C)  convulsion 
D)  bursitis 
E)  muscular dystrophy

Question 15

Which muscle injury is characterized by a twisting of a joint leading to swelling and injury?

Accepted Answer

A)  sprain 
B)  strain 
C)  tendinitis 
D)  bursitis 
E)  myalgia 
A)  sprain 
B)  strain 
C)  tendinitis 
D)  bursitis 
E)  myalgia

Question 16

Each actin molecule is shaped like a golf club,with a straight portion ending in a globular head.

Accepted Answer

A) True 
 B)False

Question 17

One motor neuron activates one muscle fiber.

Accepted Answer

A) True 
 B)False

Question 18

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. 
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.

Question 19

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 20

What do smooth,cardiac,and skeletal muscle all have in common?

Accepted Answer

A)  They are all uninucleated. 
B)  They are all striated. 
C)  They are all found in the walls of blood vessels. 
D)  The cells of these muscles are all called muscle fibers. 
E)  They all interlock at intercalated disks. 
A)  They are all uninucleated. 
B)  They are all striated. 
C)  They are all found in the walls of blood vessels. 
D)  The cells of these muscles are all called muscle fibers. 
E)  They all interlock at intercalated disks.

Exam 13: Muscular System

A muscle fiber is made up of many

Explain the differences between fast-twitch and slow-twitch muscle fibers.

What is the reservoir for Ca2+ in the body?

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

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

Which of the following does not attach to the sternocleidomastoid muscle?

Temperature-sensitive neurons in the skin are responsible for initiating shivering.

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

The origin of a muscle is on a stationary bone.

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

Which way does the adductor longus move the thigh?

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

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

Which of the following injuries is most likely to happen to the ankle?

Which muscle injury is characterized by a twisting of a joint leading to swelling and injury?

Each actin molecule is shaped like a golf club,with a straight portion ending in a globular head.

One motor neuron activates one muscle fiber.

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

What ion is responsible for initiating muscle contraction?

What do smooth,cardiac,and skeletal muscle all have in common?

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