The human body works in, a) games, b) systems, c) machines, The respiratory system brings __ into the lungs., a) water, b) oxygen, c) blood, The respiratory system takes____out of the lungs., a) carbon dioxide, b) oxygen, c) food, Which is NOT part of the respiratory system?, trachea, lungs, arteries, The circulatory system carries, air, blood, water, The heart pumps blood into, a) arteries, b) lungs, c) trachea, Cells use oxygen to, a) stay healthy, b) sleep, c) grow hair, Cells produce, oxygen, carbon dioxide, water, Carbon dioxide goes back to the, stomach, lungs, brain, The diaphragm helps you, breathe, eat, see.

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