The heart pumps blood.
A heartbeat is a pulsation of the heart.
Blood moves oxygen and food around the body.
RESPIRATORY SYSTEM
We breathe air through our nose and our mouth.
The air goes to our lungs. Our blood takes the oxygen from the air.
When we breathe in, our lungs expand.
When we breathe out, the lungs contract. We breathe out the air we do not need.
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