Following damage to axons nearby, oligodendrocytes
A. secrete growth factors.
B. do not secrete any chemicals.
C. secrete growth-inhibitory molecules.
D. grow their own fibers to occupy the space.
C
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Which hormone is not entirely antagonistic to insulin with respect to nutrients in the blood?
a. epinephrine b. glucagon c. cortisol d. growth hormone e. Both a and c
The function of the microtrabecular lattice is
a. to maintain asymmetrical cell shapes. b. to suspend and functionally link the largest cytoskeletal elements and organelles. c. to provide for cellular contractile systems. d. to serve as mechanical stiffeners. e. serve as the chief structural units of cilia.
A sudden increase in pressure within the carotid sinus leads to
a. increased sympathetic nerve activity. b. increased sympathetic nerve activity and decreased parasympathetic nerve activity. c. decreased sympathetic nerve activity and increased parasympathetic nerve activity. d. decreased sympathetic nerve activity. e. none of these answers.
When macula densa cells experience increased Na+ concentration in the filtrate, they respond by
A. increasing aldosterone secretion. B. increasing afferent arteriole constriction. C. decreasing renin secretion. D. decreasing urine production. E. increasing renin secretion