A condition called ________ is a failure of the testes to descend into the scrotum.
Fill in the blank(s) with the appropriate word(s).
cryptorchidism
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Growth hormone exerts its effects on growth
a. by stimulating production of somatomedins. b. by directly invoking gene activity. c. by elevating blood glucose levels. d. by increasing fat metabolism. e. by increasing thyroid hormone levels.
Glucose, amino acids, and fatty acids can be metabolized within the cell to liberate ________.
A. nitrogen B. oxygen C. energy D. hydrogen E. carbon dioxide
The number of possible combinations of genes in humans is virtually limitless. One reason is random assortment of chromosomes and the other is
A. crossing over. B. spermiogenesis. C. nondisjunction. D. random mating. E. reduction division.
Wallerian degeneration involves the breakdown of
A. the segments of axon and myelin sheath between the site of damage and the cell body. B. macrophages and microglia that have completed the job of CNS cleanup after trauma. C. the neurilemma both central and peripheral to the site of trauma. D. the segments of axon and myelin sheath between the site of damage and the peripheral effector.