When we obtain calcium from a dietary supplement, the absorption of magnesium and copper from food may be reduced because
A. magnesium and copper both have the same valence as the calcium, so there is competition for absorption sites.
B. excess calcium means the magnesium and copper cannot be solubilized in water.
C. calcium interferes with the digestion of trace minerals.
D. excess calcium can destroy the villi of the intestinal tract.
Answer: A
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Body mass index is
A. a percentage of body weight. B. a measure of body density. C. the ratio of a person's body weight to his or her height squared. D. the ratio of a person's height to the square of his or her body weight.
A food that provides 100 mg of magnesium and 25 kcal in a serving has a magnesium density (mg per kcal) of
a. 0.4 b. 4 c. 250 d. 2500
At the present time, processes that build up the soil are keeping in step with erosion, making it possible for the world to sustain its growing population
a. True b. False Indicate whether the statement is true or false
All of these factors contribute to the development of ascites except _____
a. portal hypertension b. reduced albumin synthesis c. sodium and water retention by the kidneys d. obesity e. liver damage