Diffusion Through Cell Membranes

Question 1

Name three alveoli adaptations

Answer 1

1) Large SA
2) Moist lining to maximise diffusion
3) Thin walls to maximise diffusion

Question 2

What do the villi do?

Answer 2

Absorb digested food from small intestine to the blood

Question 3

Name three adaptations of the villi

Answer 3

1) Single layer of surface cells

2) Good blood supply for absorption

Question 4

What do the alveoli do?

Answer 4

Site of oxygen exchange into the blood and carbon dioxide exchange into the lungs