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The lowest percentage of body fluids occurs in:

A.

young adults

B.

children

C.

infants

D.

elderly adults

Answer and Explanation

The Correct Answer is D

A. young adults: They have a relatively high percentage of body water (50–60%).

B. children: Children have more body water than adults.

C. infants: Infants have the highest body water content (~70–80%).

D. elderly adults: Aging leads to a decrease in lean body mass and total body water.


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Related Questions

Correct Answer is A

Explanation

A. Is secreted when water intake is too low: ADH promotes water reabsorption by the kidneys when the body is dehydrated.

B. Increases bone formation: Bone formation is regulated by calcium and vitamin D, not ADH.

C. Regulates acid-base balance: The kidneys and lungs regulate acid-base balance, not ADH directly.

D. Stimulates the production of large amounts of urine: ADH reduces urine output by conserving water.


Correct Answer is A

Explanation

A. Plasma: Interstitial fluid is the fluid that surrounds and bathes the cells in tissues, facilitating nutrient exchange and waste removal. It is essentially derived from plasma, the liquid component of blood, but lacks the high concentration of proteins found in plasma.

B. Blood: Blood is composed of plasma and cells; it’s not considered interstitial fluid.

C. Packed red cells: These are blood cells separated from plasma and not part of interstitial fluid.

D. Bile: Bile is produced by the liver to aid digestion, not part of the interstitial fluid.

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