The surgical removal of the foreskin is called
A) circumcision.
B) orchidectomy.
C) tubectomy.
D) vasectomy.
E) pupectomy.
A
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The sodium-potassium exchange pump
A) must re -establish ion concentrations after each action potential. B) transports sodium ions into the cell during depolarization. C) requires ATP to function. D) moves sodium and potassium in the direction of their chemical gradients. E) transports potassium ions out of the cell during repolarization.
Which of the following statements about light detection is TRUE?
a. Light detection is synonymous with vision. b. Light detection is always initiated in a rod or cone photoreceptor, though these need not be located in an eye. c. Even in its most primitive form, light detection evolved in structures dedicated to this purpose. d. Light detection evolved numerous times in a variety of structures. e. None of these.
Which of the following become connected by myosin cross-bridges during muscle contraction?
A) thin filaments and thick filaments B) thick filaments and titin filaments C) Z disks and actin filaments D) thick filaments and T tubules E) thin filaments and T tubules
Which of the following would be most likely to occur in an adult male whose Sertoli cells have begun to produce excessive amounts of inhibin?
A. FSH secretion would be selectively inhibited, but LH secretion would be normal. B. Spermatogenesis would be increased but testosterone secretion would be normal. C. Spermatogenesis would be increased because testosterone production would be above normal. D. Gonadotropin-releasing hormone levels and spermatogenesis would increase above normal. E. Both FSH and LH secretion would rise above normal levels.