Question

4.
How is
How are the lungs designed in human beings to maximise the arca for
exchange of gases?​

Answer 1

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Each lungs has highly branched respiratory tract called respiratory tree. A primary bronchus divides into secondary bronchi, secondary into segmental bronchi, segmental bronchus into bronchioles which divides into terminal bronchioles, respiratory bronchioles, alveolar sacs and alveoli.

Alveoli are small rounded pouches which are extremely thin walled and possess a network of capillaries over their surface. They function as respiratory surfaces.

The total area of all the alveoli is more than 80m^2. It is several times more than the surface of the whole human body.

Thus, the human lungs are designed to maximise the area of exchange of gases.

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Answer 2

Answer:

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Lungs play a major role in the respiratory system. In humans, a pair of lungs are designed in such a way that they are lined by a thin membrane, the smaller tubes called bronchioles a balloon-like structure called alveoli and network of blood capillaries increase the surface area for exchange of gases.

Lungs play a major role in the respiratory system. In humans, a pair of lungs are designed in such a way that they are lined by a thin membrane, the smaller tubes called bronchioles a balloon-like structure called alveoli and network of blood capillaries increase the surface area for exchange of gases.Humans have two lungs and are situated within the thoracic cavity of the chest. They are soft spongy and elastic organ enclosed in a thin membranous sac called the pleura. Lungs are divided into a smaller structure called bronchi which are divided into bronchioles. Alveoli are small, round or balloon-like structure found the end of the bronchioles and provide a larger surface area and maximizes the exchange of gases inside the lungs.

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