10 - Membrane Transport Flashcards
1
Q
need for small molecules across membranes?
A
uptake of nutrients
regulate ion conc
excrete metabolic waste
2
Q
2 ways small mols can be trasnported
A
passive or active transport
3
Q
types of passive trans?
A
simple and facil diffusion
4
Q
membrane proteins/channels involved in fac.diffusion?
A
channels and transporters
5
Q
how do ion channels work [K channel example]?
A
- selective to an ion
- driven by electro/chem grad
k example
-l dehydrated to pass through selectivity filter
6
Q
how do transporters work [Glucose]?
A
- Gluts
- glucose into rbc
- deficiency - microcephaly
- maintains a gradient
7
Q
membrane proteins involved in active transport?
A
ATP DRIVEN PUMPS
COUPLED TRANSPORTERS
8
Q
how do ATP driven pumps work [NA/K pump]
A
pump against the conc gradient na out for k in - 3 Na bind and pump hydrolyses ATP - Pump gets phosphorlysted [NA dep phosp] - confo change na transferred - 2 K bind and pump is dephosp - orig conform and K in
