Question

give three reason why alveoli are good for gas exchange​

Answer 1

Answer:

Here are some features of the alveoli that allow this:

they give the lungs a really big surface area.

they have moist, thin walls (just one cell thick)

they have a lot of tiny blood vessels called capillaries.

Answer 2

Answer:

• During inspiration, air flows into the alveoli until the alveolar pressure equalizes the atmospheric pressure and the alveoli gets inflated.
• During expiration, air flows out of the alveoli until the alveolar pressure equalizes the atmospheric pressure and the alveoli gets deflated.
• Alveoli secret Surfactant (the thin non-cellular films made of protein and phospholipids covering the alveolar membrane that lowers the surface tension in the alveoli and prevents the lungs from collapsing)