Lungs
You breath so regularly that it is easy to take your lungs for granted. you can’t ever stop yourself from breath and if you try your lungs are complex organs, but what they do is take a gas that your body needs to get rid of carbon dioxide and exchange it for a gas that your body can use 
oxygen.
Heart
The blood provides your body with the oxygen and nutrients it need. It also carries away waste. Your heart is sort of like a pumps, or two pumps in one. The right side of your heart receives blood from thee body and pumps it yo the lungs.
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