Question

1. The thin walls of alveoli are richly supplied with__________
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Answer 1

Answer:

blood capillaries

(i) The alveoli are thin walled and richly supplied with a network of blood capillaries to facilitate the exchange of gases between blood and the air filled in alveoli. (ii) Alveoli have balloon - like structures with thin elastic walls. These provide

Answer 2

Answer:

blood capillaries

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