How are the alveoli designed to maximize the exchange of gases...
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there are millions of alveoli present inside both the lungs , when we breathe in the alveolis expand taking in oxygen and when we breathe out they relax, also there are millions of blood capillaries present in each alveoli (blood capillaries are the junctions where the distributed veins and arteries meet) , the exchange of gases takes place in these capillaries. here oxygen comes in and goes to the body for utilisation and at the same time carbon dioxide (used gas) comes from the body into the capillaries and goes out.
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The alveoli provide a surface where the exchange of gases cam take place.the walls of the alveoli contain an xtensive network of blood vessels.when we breathe in,we lift our ribs and flatten our diaphragm,and as a result the chest cavity becomes larger.bcoz of this air is sucked into the lungs nd fills the xpanded alveoli.the blood brings co^2 from the rest of bodynd release into the alveoli,nd oxygen in the alveolar air is taken up by blood to be transported to all the cells of body.
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