How do we respire??? explain the process
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Inhalation-when the muscles attached to ribs contract & diaphragm contract chest cavity expands .Thus increases the capicity to hold oxygen.Here volume increases but preassure decreases ,so air moves in.
When the oxygen is transported in blood &the carbon-di-oxide gets out of the deoxygenated blood the pressure in the lung increase.
Exahalation -similarly, when chest cavity contracts leads to moving out of carbon di oxide..
And this cycle contniues...........