Substance Exchange Flashcards
1
Q
What organ is a type of exchange surface
A
Our lungs
2
Q
Why are lungs good exchange surfaces
A
Because they have a large surface area to volume ratio
There is a small diffusion rate
There is a steep concentration gradient because the lungs have a good blood supply and are well ventilated.
3
Q
Osmosis
A
Is the movement of water from an area of high to an area of low water potential.
4
Q
Where does osmosis take place
A
Through a semi-permeable membrane
5
Q
What does sucrose do
A
It decreases an objects weight by moving the water out by osmosis
6
Q
Which process of substance exchange does require energy?
A
Active transport
