Alveoli Flashcards
1
Q
What are alveoli?
A
an exchange surface
2
Q
Which gases are exchanged?
A
oxygen and carbon dioxide
3
Q
Why do multi-cellular organisms need exchange surfaces?
A
they have a small surface area compared to their volume
4
Q
How are the alveoli adapted to provide an effective exchange surface?(4 points)
A
- moist lining
- good blood supply
- very thin walls
- enormous surafce area
5
Q
How are the gases exchanged?
A
Diffusion
6
Q
Blood arrives at the alveoli with a high or low concentration of carbon dioxide?
A
High carbon dioxide
7
Q
Describe the diffusion process
A
Oxygen diffuses from the air in the alveoli into the blood.
8
Q
What is the job of the lung?
A
Transfer oxygen to the blood. Remove carbon dioxide from the blood.
