21. A good food source of vitamin K is

a. spinach.

b. sunflower oil.

c. pork.

d. oranges.

22. In the past, vitamin A content was listed in International Units (IU); it is now listed in

a. milligrams.

b. micrograms.

c. beta-carotene equivalents.

d. retinol equivalents.

23. The hormones that participate in calcium metabolism are

a. estrogen and oxytocin.

b. cortisone and epinephrine.

c. aldosterone and thyroxine.

d. parathyroid and calcitriol.

24. There is a metabolic partnership between vitamin E and

a. zinc.

b. chromium.

c. selenium.

d. iron.

25. An athlete who increases his or her intake of pasta will also increase his or her need for

a. folic acid.

b. thiamin.

c. pyridoxine.

d. vitamin C.

26. An alcoholic is most likely to be deficient in

a. biotin.

b. folic acid.

c. thiamin.

d. pyridoxine.

27. The three body systems that can be affected by a thiamin deficiency are the _____ systems.

a. nervous, respiratory, and urinary

b. nervous, cardiovascular, and gastrointestinal

c. gastrointestinal, respiratory, and endocrine

d. lymphatic, cardiovascular, and endocrine

28. The vitamin that is destroyed by light is

a. vitamin C.

b. niacin.

c. riboflavin.

d. biotin.

29. The most important source of riboflavin is

a. milk.

b. lean meats.

c. enriched grains.

d. green leafy vegetables.

30. The function of all B-complex vitamins is to

a. regulate fluid balance.

b. function as body structures.

c. function as coenzymes.

d. provide calories for energy.