Question

How are the alveoli designed to maximize the exchange of gases

Answer 1

The alveoli provide a surface where the exchange of gases take place .The walls of the alveoli contain an extensive network of blood vessels .When we breath in we lift our ribs and flatten our diaphragm and chest cavity becomes larger as a result .Air is sucked it the lungs and fills the expanded alveoli .The blood brings co2 from the rest of the body for release into the alveoli and the oxygen in the alveolar blood vessels to be transported to all the cells in the body.

Answer 2

Gaseous exchange in our body takes place in the alveoli of lungs. The oxygen of air diffuses out from the alveoli walls into the blood. As the blood passes through the tissues of the body , the oxygen present in it diffuses into the cells. This oxygen combines with the digested food present in the cells, to release energy. Carbon dioxide gas which is produced as a waste product during Respiration in the cells of the body tissues, diffuses into the blood . blood carries the carbon dioxide back to the lungs, where it diffuses into the alveoli.


The human lungs have been designed to maximise the exchange of gases, There are millions of alveoli in the lungs . The presence of millions of alveoli in the lungs provide a very large area for the exchange of gases . The avialibility of large surface area maximises the exchange of gases.

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