Chapter 9, Problem 1SC

Regarding fluid intake in school-age children, which of the following statements is most correct? a. Soft drinks are good choices for hydration during exercise because the high carbohydrate content provides quick energy. b. Childrens caffeine consumption decreases as they get older. c. Diluted fruit juice is a good choice for hydration during exercise, as children are more likely to drink it than water. d. Adults who are supervising children during exercise can rely on the children to let them know when they are thirsty.

Drinking too much water can be a bad thing. If someone sweats heavily and drinks lots of water, their sodium levels drop. The resulting water intoxication can be fatal. Why is the sodium balance so important?

Water concentration in the body is critical for proper functioning. A persons body retains very tight control on water levels without conscious control by the person. Watch this video (http://openstaxcollege.org/l/H2Ocon) to learn more about water concentration in the body. Which organ has primary control over the amount of water in the body?