Question 1

Of the three types of muscle tissue,which has multinucleated fibers?

Accepted Answer

A) smooth muscle 
B) cardiac muscle 
C) skeletal muscle 
D) both smooth and skeletal muscles 
E) both cardiac and smooth muscles 
A) smooth muscle 
B) cardiac muscle 
C) skeletal muscle 
D) both smooth and skeletal muscles 
E) both cardiac and smooth muscles C

Question 2

List the functions of the skeletal muscles.

Accepted Answer

1.Support of the body.
2.Movement of the bones and other body structures.
3.Maintenance of fluids in the cardiovascular and lymphatic system.
4.Maintenance of a constant body temperature.
5.Protection of the internal organs and the stabilization of joints.

Question 3

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

Accepted Answer

A) True 
 B)False  True

Question 4

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 5

What happens when the arrector pili muscles contract?

Accepted Answer

A) Your head nods "yes." 
B) Your leg kicks out. 
C) The hairs on your skin stand on end. 
D) The blood from your skin is rerouted to your core. 
E) You tap your finger. 
A) Your head nods "yes." 
B) Your leg kicks out. 
C) The hairs on your skin stand on end. 
D) The blood from your skin is rerouted to your core. 
E) You tap your finger.

Question 6

The origin of a muscle is on a stationary bone.

Accepted Answer

A) True 
 B)False

Question 7

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. 
A) fasciA. 
B) fascicle. 
C) dense connective tissue. 
D) muscle fiber. 
E) myofibril.

Question 8

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.

Question 9

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 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

When a muscle contracts,the H zone almost disappears.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

Fast-twitch muscle fibers are usually ae

Question 16

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 17

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

Accepted Answer

A) True 
 B)False

Question 18

What supplies the energy for muscle contraction?

Accepted Answer

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

Question 19

Of the three types of muscle tissue,which is not striated?

Accepted Answer

A) smooth muscle 
B) cardiac muscle 
C) skeletal muscle 
D) skeletal and smooth lack striations 
E) cardiac and smooth lack striations 
A) smooth muscle 
B) cardiac muscle 
C) skeletal muscle 
D) skeletal and smooth lack striations 
E) cardiac and smooth lack striations

Question 20

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 1000 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. 
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.

Exam 13: Muscular System

Of the three types of muscle tissue,which has multinucleated fibers?

List the functions of the skeletal muscles.

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

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

What happens when the arrector pili muscles contract?

The origin of a muscle is on a stationary bone.

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

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

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

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

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

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

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

When a muscle contracts,the H zone almost disappears.

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

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

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

What supplies the energy for muscle contraction?

Of the three types of muscle tissue,which is not striated?

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 1000 muscle fibers?

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