Question 1

Muscle atrophy that progresses with aging is caused by reduction in

Accepted Answer

A)  muscle strength, but not motor neuron activity.
B)  motor neuron activity, but not muscle strength.
C)  connective tissues.
D)  the sizes of muscle fibers.E) All of the above
F) B) and C) D

Question 2

The outermost layer of connective tissue surrounding a skeletal muscle is the

Accepted Answer

A)  epimysium.
B)  perimysium.
C)  endomysium.
D)  sarcomysium.E) B) and D)
F) B) and C)

Question 3

Muscle fibers are basically a collection of

Accepted Answer

A)  muscles.
B)  sarcomeres.
C)  connective tissue fibers.
D)  synapses.E) All of the above
F) B) and D)

Question 4

A gluteal gait, in which a person walks with a waddling limp, is usually caused by a disorder of the

Accepted Answer

A)  gluteus maximus and gluteus medius.
B)  gluteus maximus and gluteus minimus.
C)  gluteus medius and gluteus minimus.
D)  gluteus maximus and tensor fasciae latae.E) B) and D)
F) B) and C) C

Question 5

Fibers of muscles whose motor neurons are severed

Accepted Answer

A)  hypertrophy.
B)  may be replaced by fat or fibrous connective tissue.
C)  cannot ever be reinnervated.
D)  die as their sarcomeres are progressively eliminated.E) A) and C)
F) A) and B)

Question 6

The striated appearance of skeletal muscle fibers results from the

Accepted Answer

A)  transverse tubule pattern.
B)  sarcoplasmic reticulum network.
C)  sarcomere organization.
D)  cisternae placement.E) A) and B)
F) None of the above

Question 7

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

Accepted Answer

A) True 
 B)False  False

Question 8

In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the

Accepted Answer

A)  refractory period.
B)  relaxation period.
C)  latent period.
D)  contraction period.E) A) and D)
F) All of the above

Question 9

Since many muscles are named for their location (origin and insertion), the zygomaticus muscles probably originate on the ________ bone of the skull.

Accepted Answer

The answer of Since many muscles are named for their...

Question 10

Since many muscles are named for their location (origin and insertion), the occipitalis muscle probably originates on the ________ bone of the skull.

Accepted Answer

The answer of Since many muscles are named for their...

Question 11

Which of the following is unique in that its insertion is to fascia and not bone?

Accepted Answer

A)  Palmaris longus
B)  Extensor carpi ulnaris
C)  Flexor digitorum profundus
D)  Extensor digitorumE) None of the above
F) A) and C)

Question 12

The characteristic reddish brown color of skeletal muscle comes from which substance?

Accepted Answer

A)  Actin
B)  Myosin
C)  Myoglobin
D)  CalciumE) A) and B)
F) All of the above

Question 13

The muscle that causes an action is the

Accepted Answer

A)  synergist.
B)  antagonist.
C)  agonist.
D)  mediator.E) None of the above
F) All of the above

Question 14

People with myasthenia gravis have a deficiency of

Accepted Answer

A)  titin molecules.
B)  troponin molecules.
C)  acetylcholine receptors
D)  sarcomeres.E) B) and C)
F) A) and D)

Question 15

In the initiation of muscle fiber contraction, calcium ions bind to tropomyosin, exposing active sites on actin for cross-bridge formation.

Accepted Answer

A) True 
 B)False

Question 16

Smooth muscle has ________ and not troponin.

Accepted Answer

A)  calmodulin
B)  fibronectin
C)  norepinephrine
D)  titinE) B) and C)
F) A) and D)

Question 17

What enzyme degrades acetylcholine, keeping it from accumulating in the synapse?

Accepted Answer

A)  ATPase
B)  Myosinase
C)  Actinase
D)  AcetylcholinesteraseE) A) and D)
F) All of the above

Question 18

The increase in the number of motor units activated as a result of more intense stimulation is called

Accepted Answer

A)  latency.
B)  recruitment.
C)  threshold stimulation.
D)  sustained contraction.E) A) and D)
F) B) and D)

Question 19

The linea alba is

Accepted Answer

A)  a muscle extending from the ischial spine to the coccyx and sacrum.
B)  a curved, broad muscle on the side of the chest.
C)  a muscle beneath the skull.
D)  a band of tough connective tissue to which abdominal wall muscles attach.E) A) and D)
F) All of the above

Question 20

Bones and muscles function as mechanical devices called

Accepted Answer

A)  lifts.
B)  levers.
C)  syncytia.
D)  ladders.E) A) and B)
F) All of the above

Exam 9: Muscular System

Muscle atrophy that progresses with aging is caused by reduction in

Correct AnswerverifiedD

The outermost layer of connective tissue surrounding a skeletal muscle is the

Correct AnswerverifiedShow Answer

Muscle fibers are basically a collection of

Correct AnswerverifiedShow Answer

A gluteal gait, in which a person walks with a waddling limp, is usually caused by a disorder of the

Correct AnswerverifiedC

Fibers of muscles whose motor neurons are severed

Correct AnswerverifiedShow Answer

The striated appearance of skeletal muscle fibers results from the

Correct AnswerverifiedShow Answer

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

Correct AnswerverifiedFalse

In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the

Correct AnswerverifiedShow Answer

Since many muscles are named for their location (origin and insertion), the zygomaticus muscles probably originate on the ________ bone of the skull.

Correct AnswerverifiedShow Answer

Since many muscles are named for their location (origin and insertion), the occipitalis muscle probably originates on the ________ bone of the skull.

Correct AnswerverifiedShow Answer

Which of the following is unique in that its insertion is to fascia and not bone?

Correct AnswerverifiedShow Answer

The characteristic reddish brown color of skeletal muscle comes from which substance?

Correct AnswerverifiedShow Answer

The muscle that causes an action is the

Correct AnswerverifiedShow Answer

People with myasthenia gravis have a deficiency of

Correct AnswerverifiedShow Answer

In the initiation of muscle fiber contraction, calcium ions bind to tropomyosin, exposing active sites on actin for cross-bridge formation.

Correct AnswerverifiedShow Answer

Smooth muscle has ________ and not troponin.

Correct AnswerverifiedShow Answer

What enzyme degrades acetylcholine, keeping it from accumulating in the synapse?

Correct AnswerverifiedShow Answer

The increase in the number of motor units activated as a result of more intense stimulation is called

Correct AnswerverifiedShow Answer

The linea alba is

Correct AnswerverifiedShow Answer

Bones and muscles function as mechanical devices called

Correct AnswerverifiedShow Answer

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C

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False

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