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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The interstitial cells of the testes produce
A. seminal fluid. B. androgens. C. sperm cells. D. spermatogenic cells.
Mean arterial pressure is (indirectly/directly) proportional to ________ and (indirectly/directly) proportional to ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not a function of the spleen?
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
Which of these descriptions best matches the term "submucosal plexus"?
A) component of mucosa B) includes a sensory neural network C) secretes a watery fluid D) coordinates activity of the muscular layer E) loose connective tissue layer containing blood vessels