What structure functions to prevent entrance of food into the trachea?
a. Tongue b. Epiglottis
c. Cardiac sphincter d. Trachea sphincter
b
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Identify the role played by iodine during pregnancy.
A. It is required by the mother and fetus for thyroid function and fetal brain development. B. It helps in maintaining the body's water balance. C. It is required for fetal skeletal mineralization and maintenance of maternal bone health. D. It is required for developing the enamel in the fetus. E. It plays an important role in reactions that are involved in cell differentiation.
When body cells need more iron, the number of transferrin receptors on the cell surface
A. decreases. B. remains unchanged. C. increases.
What nutrients appear to help prevent cataract formation?
a. Iron and calcium b. Chromium and zinc c. Vitamin B12 and folate d. Vitamin C and vitamin E
Which of the following nutrients yields the most energy?
a. carbohydrates b. vitamins c. protein d. fats