what part of your body gets air ready for your lungs?

a thick, sticky liquid called mucus is produced by

the exchange of oxygen for carbon dioxide in the lungs takes place in the

a gas that is produced by the cells as they work, which leaves your body as you breathe out is

tiny blood vessels with very thin walls through which oxygen and nutrients can pass are called

when red blood cells have given up their oxygen and are traveling back to the heart, their color is

cells release energy by using oxygen to break down

nutrients are carried in the blood, to the cells by

the group of organs that gets rid of cell wastes is called

Most of the carbon dioxide produced in the body's cells is carried away by

The organs that contain many, many tiny tubes that filter nitrogen wastes from the blood are called

the body rids itself of excess water through the kidneys, skin, and the

the process of breathing in is called

the process of breathing out is called

Both oxygen and nutrients are carried by red blood cells

the body needs MORE ENERGY when it is active, so LESS oxygen is required by the cells

In a healthy person, all of the blood is cleaned by the kidneys 40 times each day

One reason the body excretes water is to maintain a normal body temperature

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