Question

How are alveoli are modified for respiration

Answer 1

thousands of alveoli clustered together which provides greater surface area

thin squamous epithelium facilitates easy diffusion of gases

Answer 2

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The alveoli are thin-walled and richly supplied with a network of blood vessels to facilitate the exchange of gases between blood and the air-filled in alveoli. They have a balloon-like structure that provides maximum surface area for exchange of gases.