Question 4:
How are the lungs designed in human beings to maximize the area for exchange of
gases?
Answer
The exchange of gases takes place between the blood of the capillaries that
surround the alveoli and the gases present in the alveoli. Thus, alveoli are the
site for exchange of gases. The lungs get filled up with air during the process of
inhalation as ribs are lifted up and diaphragm is flattened.The air that is rushed
inside the lungs fills the numerous alveoli present in the lungs.
Each lung contains 300-350 million alveoli. These numerous alveoli increase the
surface area for gaseous exchange making the process of respiration more efficient.
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