Topic 3 - SA:V Ratio Flashcards
1
Q
Small organisms have a larger or smaller surface area to volume ratio
A
Larger
2
Q
How to single celled organisms exchange substances?
A
Diffusion across the cell membrane directly into or out of the cell
3
Q
Give two reasons why in multicellular organisms diffusion across out of membranes would be too slow
A
The diffusion distance is too large due to internal organs as well as a low surface area: volume ratio
4
Q
What two things do gas exchange surfaces have that increase the rate of diffusion?
A
Small diffusion distance and a large surface area
5
Q
What does Fick’s Law state?
A
Rate of diffusion ∝ (surface area x concentration) / distance
