Question 1

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 A

Question 2

What structure attaches a muscle to a bone?

Accepted Answer

A)  ligaments 
B)  tendons 
C)  bursae 
D)  sarcolemma 
E)  sarcoplasm 
A)  ligaments 
B)  tendons 
C)  bursae 
D)  sarcolemma 
E)  sarcoplasm B

Question 3

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. A

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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 6

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 7

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

Question 8

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 9

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 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 12

What information does the word rectus give you about a muscle?

Accepted Answer

A)  the size of the muscle fibers 
B)  the attachment of the muscle fibers 
C)  the action of the muscle fibers 
D)  the shape of the muscle fibers 
E)  the direction of muscle fibers 
A)  the size of the muscle fibers 
B)  the attachment of the muscle fibers 
C)  the action of the muscle fibers 
D)  the shape of the muscle fibers 
E)  the direction of muscle fibers

Question 13

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

Accepted Answer

Fast-twitch muscle fibers are usually ae

Question 14

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 15

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

Accepted Answer

A) True 
 B)False

Question 16

Fibromyalgia is a temporary condition of achy muscles, usually due to overuse.

Accepted Answer

A) True 
 B)False

Question 17

What is the deltoid muscle shaped like?

Accepted Answer

A)  a long thin line 
B)  a square 
C)  a triangle 
D)  a circle 
E)  a trapezoid 
A)  a long thin line 
B)  a square 
C)  a triangle 
D)  a circle 
E)  a trapezoid

Question 18

Of the three types of muscle tissue, which is voluntary?

Accepted Answer

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

Question 19

Muscles can only pull; they cannot push.

Accepted Answer

A) True 
 B)False

Question 20

In good muscle tone, how many motor units are contracted?

Accepted Answer

A)  none 
B)  some 
C)  all 
D)  5 -10% of the motor units 
E)  10 - 15% of the motor units 
A)  none 
B)  some 
C)  all 
D)  5 -10% of the motor units 
E)  10 - 15% of the motor units

Exam 12: Muscular System

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

What structure attaches a muscle to a bone?

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

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

What supplies the energy for muscle contraction?

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

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

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

What happens when the arrector pili muscles contract?

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

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

What information does the word rectus give you about a muscle?

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

What is the reservoir for Ca2+ in the body?

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

Fibromyalgia is a temporary condition of achy muscles, usually due to overuse.

What is the deltoid muscle shaped like?

Of the three types of muscle tissue, which is voluntary?

Muscles can only pull; they cannot push.

In good muscle tone, how many motor units are contracted?

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