5th grade- respiratory excretion

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

the process of breathing in is called

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

cells release energy by using oxygen to break down

Both oxygen and nutrients are carried by red blood cells

the process of breathing out is called

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

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