Which of the following is generally accepted as a secondary sex characteristic?
A) The vagina
B) The prostate gland
C) The enlargement of the breasts
D) The uterus
E) The presence of testes
C
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The vasa recta is a specialized portion of the
A. glomerulus. B. afferent arteriole. C. efferent arteriole. D. peritubular capillary. E. interlobular artery.
"Water, water, every where, nor any drop to drink" is a phrase from the Rime of the Ancient Mariner by Samuel Taylor Coleridge. This poem describes an ocean ship unable to sail to land and running out of its supply of fresh water; sailors have long known that drinking seawater cannot prevent death from dehydration. What would result if the sailors attempted to alleviate their dehydration by
drinking seawater? Justify your answer by describing kidney physiology. Why wouldn't reflexes, in response to dehydration, fully compensate? What does this illustrate about the force allowing kidneys to retain water under more normal conditions? What will be an ideal response?
The major determinant of resistance to blood flow is the:
a. percentage of red blood cells b. blood's pH level c. blood vessel's strength d. blood vessel's percentage of smooth muscle e. blood vessel's radius
The effect that a neurotransmitter has on the postsynaptic membrane does not depend on the
A) frequency of neurotransmitter release. B) nature of the neurotransmitter. C) characteristics of the receptors. D) quantity of neurotransmitters released. E) the strength of the action potential.