Aging ordinarily leads to decreases in which of the following?
a. Creatinine clearance and insulin secretion
b. Blood carbon dioxide and saliva produc-tion
c. Left ventricle-wall thickness and skin healing time
d. Serum triiodothyronine (T3) and gastric pepsin
D
Serum T3 and pepsin secretion both decrease with aging. Creatinine clearance declines, but insu-lin secretion normally remains stable. Saliva production decreases, but blood carbon dioxide normally remains unchanged. Left ventricle-wall thickness and skin healing time both increase with aging.
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