Topic 1 - Exchanging Materials Flashcards
1
Q
What do single-celled organisms have?
A
A relatively large surface area to volume ratio
2
Q
Why do single-celled organisms have a large SA:V ratio?
A
So all necessary exchanges with the environment can take place over this surface
3
Q
What are multicellular organisms specialised with?
A
effective exchange materials
4
Q
What do exchange surfaces feature?
A
- Thin walls
- Large surface area
5
Q
What do the features of an exchange surface do?
A
They give short diffusion distances
6
Q
What are exchange surfaces like in animals?
A
have an effective blood supply or for gaseous exchange be ventilated
