AAAS Science Assessment ^beta

How do molecules from food and molecules of oxygen get to the cells of the body?

1. Molecules from food and molecules of oxygen are carried by a series of tubes that connect the mouth and nose to the rest of the body.
2. Molecules from food and molecules of oxygen are carried by a series of tubes that connect the stomach and lungs to the rest of the body.
3. Molecules from food and molecules of oxygen are carried by a network of arteries, veins, and microscopically small blood vessels (capillaries) to the rest of the body.
4. Molecules from food and molecules of oxygen move directly from the mouth and nose to the rest of the body without going through any kind of tubes.