ADH acts mostly on the
A) nephron loop.
B) PCT.
C) collecting system.
D) glomerulus.
E) None of the answers are correct.
C) collecting system.
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A man is exposed to a virus which specifically targets and kills sustentacular cells (Sertoli cells). What effect will this have on spermatogenesis?
A. Spermatogenic cells will starve and cease development because they won't receive the nutrients or support they need. B. Spermatogonia will not be stimulated to divide because of lack of testosterone secretion. C. Mature sperm won't be loaded with enough ATP to fuel flagellar movement. D. Sperm cells will not mature because spermiogenesis will not occur after meiosis.
In the case of most neurons, the arrival of a nerve impulse at the terminal bouton immediately triggers
A) long-lived effects at the synaptic membrane. B) a change in the permeability of the postsynaptic plasmalemma. C) release of ACh at the presynaptic membrane. D) an action potential. E) generation of an action potential in the axon.
Which of the following is not a component of saliva?
a. amylase b. mucus c. pepsin d. lysozyme e. water
The primary goal of the immune response is
A. stimulation of mitotic activity in order to replace cells damaged by infection. B. maintenance of the proper ionic balance between lymph and blood. C. destruction or inactivation of pathogens and foreign material. D. removal of antibodies from lymph and lymphatic organs. E. reduction of the number of circulating memory lymphocytes.