The kidneys produce renin when
A. the urine becomes acidic.
B. the peritubular capillaries dilate.
C. the blood pressure in the afferent arteriole decreases.
D. sodium chloride concentration in the distal convoluted tubule increases.
E. the blood pressure in the afferent arteriole increases.
C
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Neil accidentally ingests a substance that activates the complement cascade in the absence of bound antibodies. This substance would _________.
A) increase circulation of lymph. B) cause extensive cellular damage. C) produce a fever. D) activate blood clotting. E) prevent inflammation.
Which of the following vitamins is necessary for producing collagen?
A) Vitamin C B) Vitamin D C) Thiamine D) Biotin
The main muscle used in breathing is the ____
a. diaphragm b. transversus abdominis c. internal oblique d. quadratus
AB ? A + B is to decomposition as A + B ? AB is to
A) exchange. B) synthesis. C) combustion. D) replacement. E) metabolism.