Which of the following are age-related changes that affect hydration status? (Select all that ap-ply.)
a. Decrease in thirst sensation
b. Decrease in total body water
c. Decrease in ability of kidneys to maxi-mally concentrate urine
d. Decrease in bone marrow mass
e. Decrease in bladder capacity
ANS: A, B, C
As one ages, thirst sensation decreases and is not proportional to metabolic needs in response to dehydrating conditions. There is a decrease in total body water. The kidneys are less able to maximally concentrate urine resulting in a loss of water. While there is a decrease in bone marrow mass, this does not impact hydration status. Also, as one ages, bladder capacity decreases; how-ever, this does not directly impact hydration status.
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