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Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis
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All textbooksErin C. Amerman 2nd EditionCh. 25 Fluid, Electrolyte, and Acid-Base HomeostasisProblem 25.4a

Chapter 25, Problem 25.4a

As a percentage of body weight, the total body water tends to be higher in ________ and lower in ________ ​.


a. ​infants; men

b. women; men

c. men; infants

d. infants; women

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Welcome back. Here's the next question. Which group typically has the highest percentage of total body water. A adults, B infants, c elderly or D adolescents. Well, to answer this question, we can recall that in general, the percent of the body made up of water decreases with age. So that will lead us to the correct answer. Which is choice B infants, they do have the largest percent. Um This is actually due to their relatively larger extracellular fluid compartments compared to as they get older, these larger fluid compartments have more water, giving them a higher percent body water in infants. That's about 65%. Adolescents will be the next highest. But due to their nearly completing their growth and development, they're definitely lower than infants. Adults lower. Still, the average adult has around 50 to 60% body water. So definitely lower than that of infants. And to see the elderly, as we'd expect the lowest of all, they're as low as about 52% in men, over 60 about 46% in women, over 60. And this decrease when with aging is due to a number of factors, decreased, lean body mass, reduced kidney function and alterations in the thirst sensation that can lead to decreased water intake just from being less thirsty. So choice c elderly, definitely not our answer. So again, the group that has the highest percentage of total body water is choice B infants, hope to see you in the next video.
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