Describe how the body regulates the absorption of calcium
Aided by vitamin D, the body is able to regulate its absorption of calcium by altering its production of the calcium-binding protein. More of this protein is made if more calcium is needed. Infants and children absorb up to 60 percent of the calcium they ingest, and pregnant women, about 50 percent. Other adults, who are not growing, absorb about 25 to 30 percent. People may think that taking a calcium supplement is preferable to getting calcium from food, but foods offer important fringe benefits. For example, drinking 3 cups of milk fortified with vitamins A and D will supply substantial amounts of other nutrients. Furthermore, the vitamin D and possibly other nutrients in the milk enhance calcium absorption. Some people absorb calcium better from milk and milk products than from even the most absorbable supplements. The National Institutes of Health concludes that foods are the best sources of calcium and recommends supplements only when intake from food is insufficient.
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A. lecithins. B. cholecystokinin (CCK). C. bicarbonate. D. electrolytes.
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A) binge-eating disorder B) bipolar disorder C) anorexia nervosa D) muscle dysmorphia
What is the chief reason most people choose the foods they eat?
a. cost b. taste c. convenience d. nutritional value e. habit
The positively charged electrolyte concentrated inside the cell is potassium, and the positively
charged electrolyte concentrated outside the cell is A) hydrogen. B) nitrogen. C) sodium. D) oxygen.