Chapter 5 - Diffusion Flashcards
1
Q
what is diffusion
A
the overall movement of particles from an area of high concentration to an area of low concentration (stops at equilibrium) - down a concentration
2
Q
what are the factors affecting diffusion
A
temperature and concentration
surface area and thickness of the membrane
3
Q
what is diffusion in the absence of a membrane
A
simple diffusion
4
Q
which molecules can’t freely travel through the phospholipid bilayer
A
charged particles
polar molecules can travel through slowly
5
Q
what is diffusion through channel proteins called
A
facilitated diffusion
6
Q
what is selective permeability
A
when the membrane is permeable to specific molecules (through carrier or channel proteins)
