Exchange Surfaces

Question 1

Large Surface Area

Answer 1

To increase rate of exchange.

Question 2

Very Thin

Answer 2

So diffusion distance is short.

Question 3

Selectively Permeable

Answer 3

To only allow selected materials across.

Question 4

Movement of External Medium

Answer 4

To maintain a diffusion gradient.

Question 5

Movement of Internal Medium

Answer 5

To maintain diffusion gradient.