Of the following clinical conditions affecting skeletal muscle, which is caused by a virus?

A) tetanus
B) botulism
C) Duchenne muscular dystrophy
D) polio
E) rigor mortis


Answer: D

Anatomy & Physiology

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When myosin cross-bridges bind to the active sites on actin,

A) ATP is hydrolyzed. B) They pivot toward the M line. C) The sarcomere strengthens. D) Muscle relaxation occurs. E) The I band moves closer to the Z line.

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The number of spermatids that come from one primary spermatocyte is

a. 1 b. 2 c. 4 d. 8

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The golf-ball sized structure found inferior to the urinary bladder, and surrounding the most proximal portion of the urethra, is called the ________.

A. urethra B. prostate  C. seminal vesicle D. bulbourethral gland E. ejaculatory duct

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What term means the fibrous supporting network formed of reticular fibers?

A) lobule B) septum C) adipose D) stroma E) ground substance

Anatomy & Physiology