B3 - Diffusion Through Cell Membranes Flashcards
1
Q
Why are the alveoli specialised?
A
For maximum diffusion.
2
Q
Name 4 ways that the alveoli are specialised.
A
Large surface area.Moist lining.Thin walls.Good blood supply.
3
Q
Where are the villi located?
A
In the small intestine.
4
Q
What do the villi do?
A
Help digested food be absorbed faster into the blood.
5
Q
Name 3 ways that the villi are specialised
A
Increase surface area.Single layer of surface cells.Good blood supply.
6
Q
What do the lungs do?
A
Transfer oxygen to the blood and remove waste CO2.
