exchange surfaces Flashcards
1
Q
why do multicellular organisms require specialised gas exchange surfaces
A
their small surface area to volume ration means their diffusion distance is larger and substances cannot enter cells easily
2
Q
equation for SA:vol ratio
A
ratio= SA/Vol
3
Q
why do single celles organisms have a high SA:V ratio
A
-allows simple diffusion
-large surface area allows for maximum absorption of nutrients and gases and secretion of waste products
-small volume means short diffusion distance
