Where does gas exchange in the respiratory system occur?

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Gas exchanges between

Alveolar Spaces



The function of the is to exchange two gases: ##O^2## and ##CO^2##. The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. This can be explained as follows-


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The##O^2## gas which is inhaled by us reaches to the lungs from the Wind/Respiratory pipe.


In the lungs it reaches the

Alveolar Structures

through the


. The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other.


So ##O^2## gas passes quickly through this

Air-Blood Barrier



It reaches the to the blood in the capillaries. And from there It is transferred to the


through the

Pulmonary Veins



It enters Heart through the left side of the heart, which pumps the blood to the rest of the body.




Now, Deoxygenated Blood or ##CO^2## rich Blood enters the Heart through from the right side of the Heart.


Then the blood is pumped through the

pulmonary artery

to the lungs.


Here again the ##CO^2## Rich blood passes through the

Air-Blood Barrier

and ##CO^2## gas reaches lungs from where it is released and ##O^2## gas is again Inhaled.


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