Question 1

Which is predominately made up of myosin?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) B) and E)
G) None of the above

Question 2

Which marks the boundaries of a sarcomere?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) C) and D)
G) C) and E)

Question 3

The sarcolemma of a resting muscle fiber is most permeable to

Accepted Answer

A)  calcium.
B)  potassium.
C)  sodium.
D)  lithium.
E)  magnesium.F) A) and D)
G) C) and E)

Question 4

Which of the following best describes the resting membrane potential (RMP) ?

Accepted Answer

A)  The intracellular environment is negatively charged.
B)  The intracellular environment has more positively charged sodium.
C)  The extracellular environment is negatively charged.
D)  It has a voltage of about +75 mV.
E)  It depends on the muscle fiber absorbing potassium ions from the ECF.F) A) and B)
G) B) and C)

Question 5

A reason that muscle twitches become progressively stronger in treppe is

Accepted Answer

A)  Ca₂+ accumulates in the sarcoplasm faster than the sarcoplasmic reticulum can reabsorb it.
B)  ATP is regenerated faster than it is consumed.
C)  myosin heads show faster and faster power strokes.
D)  more and more acetytlcholine is released with each stimulus.
E)  as the muscle warms up, aerobic respiration is accelerated.F) A) and D)
G) C) and D)

Question 6

Cardiac muscle has very little capacity for regeneration because it lacks

Accepted Answer

A)  satellite cells.
B)  endomysium.
C)  sarcomeres.
D)  dense bodies.
E)  somatic nerve fibers.F) None of the above
G) A) and B)

Question 7

Extensibility refers to the ability of a muscle to stretch.

Accepted Answer

A) True 
 B)False

Question 8

Some smooth muscle is autorhythmic.

Accepted Answer

A) True 
 B)False

Question 9

One somatic motor neuron is stimulated by how many muscle fibers?

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4F) B) and D)
G) C) and D)

Question 10

Release of acetylcholine at a neuromuscular junction

Accepted Answer

A)  decreases the release of Ca₂+ from the sarcoplasmic reticulum.
B)  increases permeability of the sarcolemma to Na+.
C)  decreases the positive charge on the sarcolemma.
D)  lowers the threshold of the muscle fiber.
E)  overrides the inhibitory effect of acetylcholinesterase.F) B) and C)
G) B) and E)

Question 11

Which of the following is very important for muscle to continue contraction during anaerobic respiration?

Accepted Answer

A)  cholinesterase inhibitors
B)  protease
C)  myokinase
D)  acetylcholinesterase
E)  acid phosphataseF) A) and B)
G) A) and C)

Question 12

Aerobic respiration produces approximately more ATPs per glucose molecule than glycolysis does.

Accepted Answer

A)  12
B)  24
C)  36
D)  48
E)  100F) C) and D)
G) A) and B)

Question 13

Where would you expect to find numerous gap junctions in muscular tissue?

Accepted Answer

A)  the sarcoplasmic reticulum of skeletal muscle
B)  the A bands of skeletal and cardiac muscle
C)  the sarcolemma of skeletal muscle
D)  intercalated discs of cardiac muscle
E)  multiunit smooth muscleF) B) and D)
G) A) and B)

Question 14

Which muscle(s)  can contract without the need for nervous stimulation?

Accepted Answer

A)  skeletal muscle
B)  smooth muscle
C)  cardiac muscle
D)  smooth and cardiac muscle
E)  skeletal, smooth and cardiac muscleF) A) and D)
G) A) and C)

Question 15

Dystrophin, the protein that is defective in muscular dystrophy, is normally found

Accepted Answer

A)  between the outermost myofilaments and the sarcolemma of a muscle fiber.
B)  as a transmembrane protein of the sarcolemma.
C)  in the Z discs of skeletal and cardiac muscle.
D)  in the dense bodies of smooth muscle.
E)  bridging the gap between the sarcolemma and synaptic knob.F) B) and C)
G) B) and E)

Question 16

The minimum stimulus needed to cause muscle contraction is called

Accepted Answer

A)  the threshold.
B)  the latent period.
C)  twitch.
D)  recruitment.
E)  innervation.F) C) and D)
G) B) and E)

Question 17

Which of the following has the largest mitochondria?

Accepted Answer

A)  slow oxidative fibers
B)  fast glycolytic fibers
C)  cardiac muscle
D)  smooth muscle
E)  intermediate fibersF) None of the above
G) All of the above

Question 18

The training regimen of a competitive weight lifter is designed partly to

Accepted Answer

A)  convert certain parallel muscles into stronger pennate muscles.
B)  increase the average number of myofibrils per muscle fiber.
C)  convert white muscle tissue to red muscle.
D)  increase the size of his motor units.
E)  lower the threshold for muscle excitation.F) B) and C)
G) C) and E)

Question 19

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?

Accepted Answer

A)  skeletal muscle
B)  smooth muscle
C)  cardiac muscle
D)  skeletal and smooth muscle
E)  smooth and cardiac muscleF) C) and D)
G) A) and E)

Question 20

What is the purpose of the triad?

Accepted Answer

A)  The triad stores sodium.
B)  The triad synthesizes ATP.
C)  The triad maintains the resting membrane potential.
D)  The triad removes acetylcholine from the synaptic cleft.
E)  The triad allows for Ca₂+ release when a muscle fiber is excited.F) B) and D)
G) A) and B)

Exam 11: Muscular Tissue

A reason that muscle twitches become progressively stronger in treppe is

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The minimum stimulus needed to cause muscle contraction is called

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Which of the following best describes the resting membrane potential (RMP) ?

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Cardiac muscle has very little capacity for regeneration because it lacks

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Dystrophin, the protein that is defective in muscular dystrophy, is normally found

Correct AnswerverifiedShow Answer

What is the purpose of the triad?

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Some smooth muscle is autorhythmic.

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One somatic motor neuron is stimulated by how many muscle fibers?

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The sarcolemma of a resting muscle fiber is most permeable to

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Release of acetylcholine at a neuromuscular junction

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Aerobic respiration produces approximately more ATPs per glucose molecule than glycolysis does.

Correct AnswerverifiedShow Answer

Which of the following has the largest mitochondria?

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Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?

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The training regimen of a competitive weight lifter is designed partly to

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Which is predominately made up of myosin?

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Which marks the boundaries of a sarcomere?

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Which of the following is very important for muscle to continue contraction during anaerobic respiration?

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Where would you expect to find numerous gap junctions in muscular tissue?

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Which muscle(s) can contract without the need for nervous stimulation?

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Extensibility refers to the ability of a muscle to stretch.

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