[Unit 3.1] Surface Area to Volume Ratio Flashcards
Organisms exchange substances with their environment
1
Q
why do larger organisms require mass transport systems
A
the cells are too far away from exchange surface for diffusion alone to supply oxygen. rapidly distribute & remove materials throughout organism.
2
Q
what is the purpose of mass exchange systems
A
maintain diffusion gradients that bring materials into & out cell surface membrane
3
Q
do small organisms have small or large SA:V
A
large
4
Q
do large organisms have small or large SA:V
A
small
5
Q
what are the factors affecting the amount of each material that needs to be exchanged
A
size of organism
its metabolic rate
