Exchange Surfaces Flashcards
1
Q
What do alveoli do?
A
Maximise the diffusion of O2 and CO2 e.g. large SA, very thin walls and a good blood supply
2
Q
What is the small intestine covered in?
A
Villi- these increase the SA so digested food is absorbed much quicker into the blood. They have a very good blood supply to assist quick absorption.
3
Q
What do Guard cells do to the stomata?
A
Close them if the water is losing water faster than gaining.
4
Q
2 ways the structure of a gill is adapted for effective gas exchange?
A
Gill filaments give big SA, each gill has lamellae which further increases the SA
