The percentage of body water in children under 2 years of age compared with that of older children and adults is:
a. lower in intra- and extracellular fluid
b. higher mostly in extracellular fluid
c. about the same
d. varies significantly between all children
B
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A Incorrect. The percentage of body water in children under 2 years of age compared with that of older children and adults is never lower in intra- and extracellular fluid.
B Correct. Neonates, infants, and young children have a higher percentage of body water than adults (85% in a premature neonate, 70-75% in a neonate, compared to 50-60% in an adult), with a greater portion of this water in the extracellular fluid.
C Incorrect. The percentage of body water in children under 2 years of age compared with that of older children and adults is never about the same.
D Incorrect. The percentage of body water in children under 2 years of age compared with that of older children and adults does not vary significantly between all children, but becomes lower as children age into adulthood.
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