Air is forced into the lungs by the contraction of the

Because there is more oxygen in an alveolus than in the blood around it, oxygen diffuses

A car is to gasoline as your body is to

Substances that are needed by the body for growth, repair, and maintenance are called

Which of the following foods do NOT contain polysaccharides?

The raw materials that the body needs for growth and repair come from

What “food tube” carries food between the pharynx and the stomach?

Which of the following would NOT be found in the stomach?

Proteins are polymers of

The Food Guide Pyramid advises a person to eat more

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