Which of the following is another term for mitral valve?
A. tricuspid.
B. aortic.
C. pulmonary semilunar.
D. bicuspid.
Answer: D. bicuspid.
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All of the following are true of the intestinal phase of gastric digestion except that it
A) precedes the gastric phase. B) functions to control the rate of gastric emptying. C) involves both neural and endocrine reflexes. D) helps ensure that the functions of the small intestine proceed with relative efficiency. E) begins when chyme enters the small intestine.
Disequilibrium syndrome is a condition in which:
A) large amounts of water move by osmosis into the brain, resulting in an acute subdural hematoma. B) dialysis patients miss one or two of their treatments, resulting in hyperkalemia, azotemia, and hypotension. C) water initially shifts from the bloodstream into the cerebrospinal fluid, causing an increase in intracranial pressure. D) the concentration of urea in the bloodstream is lowered slowly, while the solute concentration of the cerebrospinal fluid remains high.
The flexor (withdrawal) reflex employs a ________, which maintains a sustained contraction.
A. closed circuit B. converging circuit C. diverging circuit D. parallel after-discharge circuit E. reverberating circuit
What is the purpose of spermatogenesis?
A. To produce four cells, each with 23 chromosomes, from a specialized stem cell with 46 chromosomes B. To produce four cells, each with 23 chromosomes, from a specialized stem cell with 23 chromosomes C. To produce two cells, each with 23 chromosomes, from a specialized stem cell with 46 chromosomes D. To produce four cells, each with 23 pairs of chromosomes, from a specialized stem cell with 46 chromosomes