4.2 Diffusion Flashcards
1
Q
Define diffusion.
A
The net movement of molecules or ions from the region of higher concentration to an area of lower concentration until it is evenly distributed.
2
Q
What is facilitated diffusion?
A
It is a passive process relies only on the inbuilt motion of diffusing molecules. There is no external input of ATP from aerobic respiration. However, it occurs at specific points - protein channels and carrier proteins.
3
Q
What are the two specific regions that facilitated diffusion in a membrane occur at?
A
- protein channels
- carrier proteins
