Surface area to volume ratio Flashcards
(6 cards)
1
Q
Why do multicellular organisms require specialised gas exchange surfaces and a mass transport system?
A
- Diffusion distance is greater
- Metabolic rate is higher
- Surface area to volume ratio is smaller
2
Q
Explain why animals need a heart and a circulatory system
A
- Many animals have a small surface area to volume ratio
- Many animals have a high metabolic rate
- Heart needed to pump blood around the body
- Diffusion is not sufficient
- Mass flow
3
Q
As animals increase in size, their
A
Surface area to volume ratio decreases
4
Q
Explain why single-celled organisms do not have a gas exchange system
A
- They have a larger surface area to volume ratio
- Therefore diffusion is not sufficient
5
Q
How can you calculate the volume of a sphere?
A
4/3πr3
6
Q
How can you calculate the surface area of a sphere?
A
4πr2
