Which statements regarding total body water (TBW) are true? (Select all that apply.)
A)During childhood, TBW slowly decreases in relationship to body weight.
B)Gender has no influence on TBW until old age.
C)Men tend to have greater TBW as a result of their muscle mass.
D)Estrogen plays a role in female TBW.
E)Older adults experience a decrease in TBW as a result of decreased muscle mass.

Question

Quizplus · Accepted Answer

During childhood, TBW slowly decreases to 60% to 65% of body weight. At adolescence, the percentage of TBW approaches adult proportions, and gender differences begin to appear. Men eventually have a greater percentage of body water as a function of increasing muscle mass. Women have more body fat and less muscle as a function of estrogens and therefore have less body water. With increasing age, the percentage of TBW declines further still. The decrease is caused, in part, by an increased amount of fat and a decreased amount of muscle, as well as by a reduced ability to regulate sodium and water balance.

Which Statements Regarding Total Body Water (TBW) Are True? (Select