NCERT Solution for Class 10 Science Chapter 6
Life Processes
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-113
Questions No-9
How are the alveoli designed to maximise the exchange of gases?
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The alveoli are the small balloon-like structures present in the lungs. The walls of the alveoli consist of extensive network of blood vessels. Each lung contains 300-350 million alveoli, making it a total of approximately 700 million in both the lungs. The alveolar surface when spread out covers about 80 m2 area. This large surface area makes the gaseous exchange more efficient.
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Exchange of the gases takes place in the alveoli. They have a balloon- like or pouch like structure which provides the maximum area for the exchange of gases. Alveoli are the tiny air sacs made up of squamous epithelium, which are present in the lungs and are thin walled, network of blood vessels are present for the exchange of gases. Numerous alveoli in the lungs show the maximum area for the exchange of gases between the air in the alveoli and into the blood in their surrounding capillaries and diffusion of oxygen occurs through this way. And, the diffusion of carbon dioxide occurs from the blood through the thin walls into the alveoli.
The wall of alveoli contains a fine network of blood capillaries. This ensures maximum exchange of gases.