The external urethral sphincter
A. is controlled by the somatic nervous system.
B. surrounds the external urethral orifice.
C. opens before the internal urethral sphincter during the micturition reflex.
D. is composed of smooth muscle fibers.
E. All of the choices are correct.
Answer: A
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Fill in the blank(s) with the appropriate word(s).
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a. salvages iron from hemoglobin b. acts as a reservoir for blood c. is a site for the maturation of T cells d. destroys worn out red blood cells
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The interstitial cells of the testes produce
A. seminal fluid. B. androgens. C. sperm cells. D. spermatogenic cells.