Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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.F) A) and B)
G) B) and C)

Question 3

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.F) C) and D)
G) B) and C)

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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) A) and C)
G) A) and E)

Question 6

What does the word sarco mean?

Accepted Answer

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

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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

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+F) D) and E)
G) B) and D)

Question 10

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 1,000 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.F) D) and E)
G) B) and D)

Question 11

Muscles can only pull; they cannot push.

Accepted Answer

A) True 
 B)False

Question 12

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

Question 13

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

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

Question 15

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 E)
G) A) and B)

Question 16

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

Question 17

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

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+F) A) and D)
G) D) and E)

Question 19

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)   myalgiaF) C) and D)
G) A) and D)

Question 20

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 musclesF) None of the above
G) A) and C)

Exam 13: Muscular System

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

Correct AnswerverifiedShow Answer

What is the difference between a tic and a spasm?

Correct AnswerverifiedShow Answer

What ion is responsible for initiating muscle contraction?

Correct AnswerverifiedShow Answer

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 1,000 muscle fibers?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What happens when the arrector pili muscles contract?

Correct AnswerverifiedShow Answer

One sarcomere

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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 biggest muscle in terms of mass) in the body?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Muscles can only pull; they cannot push.

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 does the word sarco mean?

Correct AnswerverifiedShow Answer

What supplies the energy for muscle contraction?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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