Question 1

Which may occur as a result of muscle atrophy?

Accepted Answer

A)   Reduction in muscle size
B)   Fibers become weaker
C)   Muscle loses tone
D)   Fibers waste away and die
E)   All of the choices are correct.F) A) and B)
G) D) and E)

Question 2

The narrow space that separates the motor neuron and the skeletal muscle fiber in a neuromuscular junction is called the

Accepted Answer

A)   motor end plate.
B)   synaptic vesicle.
C)   synaptic cleft.
D)   synaptic knob.E) A) and D)
F) B) and C)

Question 3

Which is a correct listing of the hierarchy of a skeletal muscle's components, beginning with the smallest?
A: Myofibrils
B: Muscle fiber
C: Fascicle
D: Skeletal muscle

Accepted Answer

A)   a, b, c, d
B)   a, c, b, d
C)   d, c, b, a
D)   c, b, a, d
E)   b, c, a, dF) A) and B)
G) A) and C)

Question 4

A typical skeletal muscle cell contains approximately ________ mitochondria.

Accepted Answer

A)   3
B)   30
C)   300
D)   3000E) None of the above
F) A) and B)

Question 5

The spring-like property that returns muscle to its original length after a contraction ends is

Accepted Answer

A)   extensibility.
B)   elasticity.
C)   contractility.
D)   treppe effect.
E)   conductivity.F) B) and E)
G) B) and C)

Question 6

In general, a skeletal muscle is composed of
A: connective tissue sheaths
B: nerves
C: arteries
D: veins
E: muscle fibers

Accepted Answer

A)   a, b, c, e
B)   a, b, d, e
C)   b, c, d, e
D)   a, b, c, d
E)   a, b, c, d, eF) D) and E)
G) C) and D)

Question 7

"Intermediate fiber" is another name for

Accepted Answer

A)   a fast-twitch, glycolytic fiber.
B)   a fast-twitch, oxidative fiber.
C)   a slow-twitch, glycolytic fiber.
D)   a slow-twitch, oxidative fiber.E) A) and C)
F) A) and B)

Question 8

In an isotonic contraction, the tension produced exceeds the resistance and muscle fibers will shorten.

Accepted Answer

A) True 
 B)False

Question 9

The characteristic of muscle that allows it to be passively stretched is

Accepted Answer

A)   conductivity.
B)   elasticity.
C)   excitability.
D)   extensibility.
E)   contractility.F) B) and C)
G) A) and E)

Question 10

Acetylcholine is released from a neuron

Accepted Answer

A)   by a primary active transport pump.
B)   by rapid diffusion when a voltage-gated ion channel opens for it.
C)   through exocytosis when a vesicle fuses with the membrane.
D)   by conduction through a gap junction from nerve to muscle.E) B) and D)
F) C) and D)

Question 11

Aerobic respiration involves the oxidation of pyruvate.

Accepted Answer

A) True 
 B)False

Question 12

A power stroke involves

Accepted Answer

A)   an actin molecule pulling a myosin molecule toward the M-line.
B)   a thin filament shortening in length and thereby shortening the sarcomere.
C)   a myosin head pulling a thin filament toward the center of the sarcomere.
D)   a thick filament pushing an actin filament towards the nearest Z-line.E) None of the above
F) A) and D)

Question 13

The most prevalent of skeletal muscle fibers in the body are ________ fibers.

Accepted Answer

A)   slow-twitch
B)   fast-twitch
C)   intermediateD) A) and B)
E) A) and C)

Question 14

This sarcomere depicts relaxed muscle. Which number identifies the M line?

Accepted Answer

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

Question 15

Growth of the uterus during pregnancy is accomplished by ________ of its smooth muscle.

Accepted Answer

A)   neither hypertrophy nor hyperplasia
B)   both hypertrophy and hyperplasia
C)   hypertrophy but not hyperplasia
D)   hyperplasia but not hypertrophyE) A) and D)
F) None of the above

Question 16

The calcium ions involved in skeletal muscle contraction bind to a(n)  ________ subunit.

Accepted Answer

A)   myosin
B)   actin
C)   elastin
D)   tropomyosin
E)   troponinF) A) and B)
G) All of the above

Question 17

One feature that helps provide fast energy to a muscle cell is the presence of granules containing the complex carbohydrate

Accepted Answer

A)   creatine phosphate.
B)   myoglobin.
C)   glycogen.
D)   nebulin.
E)   hemoglobin.F) A) and B)
G) A) and C)

Question 18

Smooth muscle cells tend to be shorter but thicker than skeletal muscle cells.

Accepted Answer

A) True 
 B)False

Question 19

Myosin kinase catalyzes the transfer of Pi from creatine phosphate to ADP.

Accepted Answer

A) True 
 B)False

Question 20

The T-tubules and sarcoplasmic reticulum are unique to muscle fibers.

Accepted Answer

A) True 
 B)False

Exam 10: Muscle Tissue

The T-tubules and sarcoplasmic reticulum are unique to muscle fibers.

Correct AnswerverifiedShow Answer

Aerobic respiration involves the oxidation of pyruvate.

Correct AnswerverifiedShow Answer

Acetylcholine is released from a neuron

Correct AnswerverifiedShow Answer

A power stroke involves

Correct AnswerverifiedShow Answer

This sarcomere depicts relaxed muscle. Which number identifies the M line?

Correct AnswerverifiedShow Answer

One feature that helps provide fast energy to a muscle cell is the presence of granules containing the complex carbohydrate

Correct AnswerverifiedShow Answer

In an isotonic contraction, the tension produced exceeds the resistance and muscle fibers will shorten.

Correct AnswerverifiedShow Answer

The most prevalent of skeletal muscle fibers in the body are ________ fibers.

Correct AnswerverifiedShow Answer

Which may occur as a result of muscle atrophy?

Correct AnswerverifiedShow Answer

Which is a correct listing of the hierarchy of a skeletal muscle's components, beginning with the smallest? A: Myofibrils B: Muscle fiber C: Fascicle D: Skeletal muscle

Correct AnswerverifiedShow Answer

"Intermediate fiber" is another name for

Correct AnswerverifiedShow Answer

In general, a skeletal muscle is composed of A: connective tissue sheaths B: nerves C: arteries D: veins E: muscle fibers

Correct AnswerverifiedShow Answer

Growth of the uterus during pregnancy is accomplished by ________ of its smooth muscle.

Correct AnswerverifiedShow Answer

Myosin kinase catalyzes the transfer of Pi from creatine phosphate to ADP.

Correct AnswerverifiedShow Answer

The spring-like property that returns muscle to its original length after a contraction ends is

Correct AnswerverifiedShow Answer

Smooth muscle cells tend to be shorter but thicker than skeletal muscle cells.

Correct AnswerverifiedShow Answer

The calcium ions involved in skeletal muscle contraction bind to a(n) ________ subunit.

Correct AnswerverifiedShow Answer

The narrow space that separates the motor neuron and the skeletal muscle fiber in a neuromuscular junction is called the

Correct AnswerverifiedShow Answer

The characteristic of muscle that allows it to be passively stretched is

Correct AnswerverifiedShow Answer

A typical skeletal muscle cell contains approximately ________ mitochondria.

Correct AnswerverifiedShow Answer

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Myosin kinase catalyzes the transfer of P_i from creatine phosphate to ADP.

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