Why do older adults generally have less total body water than younger adults?
A. As functional cells die during the aging process, less water is needed.
B. The muscle mass of older adults is smaller than the muscle mass of younger adults.
C. Older adults have a smaller extracellular fluid to intracellular fluid ratio than younger adults.
D. The plasma volume of older adults is decreased to reduce the risk for excess fluid volume and heart failure.
B
Muscle cells are a large portion of the body and contain more water than many other types of cells. As a person ages, the size of muscle cells tends to decrease and the volume of total body water decreases in proportion to this loss of muscle cell mass.
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