The portion of the nephron that attaches to the collecting duct is the
A) distal tubule.
B) proximal tubule.
C) loop of Henle.
D) minor calyx.
E) collecting duct.
A) distal tubule.
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Circular folds and intestinal villi
A) increase the surface area of the mucosa of the small intestine. B) carry products of digestion that will not pass through the walls of blood capillaries. C) produce new cells for the mucosa of the small intestine. D) secrete digestive enzymes. E) produce hormones.
The difference in color between white muscle and red muscle is accounted for by the greater abundance of glycogen in white muscle.
Answer the following statement true (T) or false (F)
The nuances of eye color arise from
A) the numbers of rods and cones in the retina. B) multiple alleles of at least 10 genes. C) the way pigments are deposited in the iris. D) how much vitamin A is in a person's diet.
The secretion of histamine by mast cells causes
a. vasodilation, bringing phagocytic cells to the site of infection. b. invading bacterial cells to lyse. c. invading bacterial cells to coagulate. d. all of these. e. none of these.