Exchange surfaces Flashcards
1
Q
What is an exchange surface?
A
Specialised surface adapted to make it easier for molecules to move across it
1
Q
Why can single celled organisms rely on diffusion
A
- large surface area to volume ratio
- short diffusion distance
2
Q
Why do larger organisms need exchange structures/systems?
A
- small surface are to volume ratio which makes efficient transport around the body too slow if just relied on diffusion
3
Q
How to calculate surface are sphere?
A
4π r²
4
Q
How to calculate volume are sphere?
A
4/3π r³
