Excretion of dilute urine requires ________.
A) relative permeability of the distal tubule to water
B) impermeability of the collecting tubule to water
C) transport of sodium and chloride ions out of the descending loop of Henle
D) the presence of ADH
B) impermeability of the collecting tubule to water
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Skin cells play an important role in producing
A. vitamin A. B. vitamin B. C. vitamin C. D. vitamin D.
Clusters of RER and free ribosomes in neurons are called
A) neurofilaments. B) neurofibrils. C) perikaryon. D) Nissl bodies. E) microglia.
During the follicular phase, granulosa cells secrete ________, which stimulates secretion of ________
A) estradiol; LH B) progesterone; FSH C) estradiol; GnRH D) estradiol; FSH E) progesterone; LH
Melatonin can pass through plasma membranes since it is derived from the nonpolar amino acid tryptophan.
Answer the following statement true (T) or false (F)