Gas exchange

Question 1

What are alveoli?

Answer 1

Tiny air sacs found in the lungs that carry out gas exchange.

Question 2

How are alveoli adapted for their function?

Answer 2

1. They have a large and moist surface area.
2. They have a rich oxygen supply.
3. They are close to capillaries, so the distance for gases to diffuse is small.
4. Only 1 cell thick so the diffusion distance is small.