Exchange Surfaces Flashcards
1
Q
Why does an increase surface area help exchange surface
A
Provides the area needed
Overcome the limitation of the SA:V ratio of larger organisms
2
Q
Give an example of increased surface area
A
Root hair cells in plants
Vickie in the small intestines
3
Q
Describe the role of the thin layer
A
Distance that substance have to diffuse are short
Process fast and efficient
4
Q
Example of thin layers
A
Alveoli in the lungs
5
Q
Why is having good bloodsupply good for exchanging surfaces
A
Substances are constantly delivered and removed from the exchange surface
Maintains steep concentration gradient
6
Q
Exapmomw of good blood supply
A
Albelooi of the lungs
7
Q
Why is ventilation useful
A
For gasseshelps maintain a conc gradient
