Tri A - Membrane Function Flashcards
1
Q
What are the 4 types of diffusion?
A
- Diffusion through pores
- Dissolving in Lipid Portion of membrane
- Carrier-Mediated
- Active Transport
2
Q
Describe Diffusion Through Pores
A
Water and other polar molecules can pass through membrane
3
Q
Describe Diffusion Through Lipid Membrane
A
The molecule must be lipid soluble
If a dissolved molecule comes in contact with the lipid layer, it may cross
4
Q
Describe Carrier-Mediated Diffusion
A
The molecule binds to a carrier protein which allows it to diffuse across the membrane
5
Q
Why do we need Active Transport?
A
To maintain the difference between the inside and outside of the cell
6
Q
What is the name for the active transport systems?
A
Membrane Pumps
7
Q
How do membrane pumps work?
A
They transport one molecule out of the cell at the same rate they transport another molecule in
