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Age-related loss of muscle mass may be influenced by all of these except:


A) degeneration of muscle fibers because of accumulation of calcium in the sarcoplasm.
B) exhaustion of the supply of muscle satellite cells.
C) an increase in the relative proportion of connective tissue to number of muscle fibers.
D) decrease in the level of testosterone.

E) C) and D)
F) A) and C)

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The area that contains no thin filaments is known as the


A) A band.
B) H zone.
C) I band.
D) intercalated disc.

E) A) and B)
F) B) and C)

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How do muscles enlarge when undergoing athletic training?

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by increasing the nu...

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This type of muscle contains intercalated discs.


A) skeletal muscle
B) smooth muscle
C) cardiac muscle

D) None of the above
E) A) and B)

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Muscle tissue is endowed with all of the following properties except


A) contractibility.
B) extensibility.
C) transmissibility.
D) excitability.

E) All of the above
F) B) and C)

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The type of attachment in which the muscle fibers seem to attach directly to a bone is


A) an aponeurosis.
B) a tendon.
C) an insertion.
D) a fleshy attachment.

E) A) and C)
F) B) and C)

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After a muscle fiber has contracted, the calcium


A) is destroyed.
B) is actively transported into the sarcoplasmic reticulum.
C) is chemically bound to the myofilaments.
D) is secreted by the Golgi apparatus.

E) A) and C)
F) B) and D)

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Both single-unit smooth muscle and this type of muscle have gap junctions.


A) skeletal muscle
B) smooth muscle
C) cardiac muscle

D) All of the above
E) B) and C)

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Of the surrounding connective tissues of the muscle, the endomysium is the most superficial.

A) True
B) False

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Muscle tissue can be characterized as being excitable and elastic, but not extensible.

A) True
B) False

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