Mostrando entradas con la etiqueta RESPIRATORY SYSTEM. Mostrar todas las entradas
Mostrando entradas con la etiqueta RESPIRATORY SYSTEM. Mostrar todas las entradas
25 oct 2012
22 abr 2012
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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