1
Q
What 3 things do good specialised exchange surfaces have?
A
High SA
Short diffusion pathway (thin)
Good blood supply/ventilation (for high conc gradient)
2
Q
Why don’t prokaryotes need specialised exchange surfaces? (3)
A
- metabolic activity lower
- SO need for O2 and glucose lower/slower
- SA:V higher
3
Q
How can you tell if SA:V is high or low?
A
If SA is higher than V, then SA:V is HIGH
If SA is lower than V, then SA:V is LOW
4
Q
How to get a simplified, integer ratio from ur calculated SA:V?
A
Divide SA and V by V
