Diffusion Through Cell Membranes Flashcards
1
Q
What is the lungs’ job?
A
Transfer oxygen to the blood and to remove waste CO2 from it
2
Q
What happens in Alveoli?, where are they? How many are there?
A
Gas exchange, Lungs, Millions
3
Q
Oxygen and CO2 [ ] through the alveoli into the blood stream
A
Diffuse
4
Q
How are alveoli specialised to maximise diffusion?
A
Enormous surface area
Moist lining for dissolving gases
Very thin walls
Good blood supply
5
Q
Where are Villi, how many are there?
A
Small intestine, millions
6
Q
What do Villi do?
A
They increase the surface area of the small intestine so that digested food is absorbed much more quickly into the blood.
7
Q
How are villi specialised to maximise diffusion and active transport?
A
Single layer of surface cells
A very good blood supply to assist quick absorption.
