Which of the following hormones causes water retention by the kidneys in times of dehydration?
A. Glucagon
B. Adrenal androgens
C. ADH
D. PTH
E. Somatostatin
Answer: C
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Why is otitis media more common in children than in adults?
A. Children have shorter, more horizontal auditory tubes. B. Children have longer, more slanted auditory canals. C. Children have small openings in the tympanic membrane that allow introduction of bacteria. D. Children are more frequently exposed to pathogens that cause ear infections. E. Children have smaller, more flexible middle ear bones.
Compare the use of inferences about the ecology, behavior, and physiology of extinct animals based on extant phylogenetic brackets with those based on analogies with living forms—for example, the inferences in this chapter about the social
behaviors of ceratopsian dinosaurs that were based on analogies with modern herbivorous mammals with horns or antlers. How might you test your conclusions in each case?
During this period, a second action potential can only be initiated by a larger than normal stimulus
a) Latent period b) Absolute refractory period c) Relative refractory period d) All of these choices e) None of these choices
A single lobe of a kidney is comprised of ________.
A. a renal medulla and two renal columns B. one collecting duct and all nephrons that drain into it C. one major calyx and all of its minor calyces D. one pyramid and the overlying cortex E. two calyces and a renal pelvis