4.2 Diffusion

Question 1

Define diffusion.

Answer 1

the net movement of molecules/ions from an area of high concentration to an area of lower concentration

Question 2

How does facilitated diffusion work?

Answer 2

an ion (channel proteins) or molecule such as glucose (carrier proteins) binds to the protein, which causes it to change shape in such a way that the molecule is released on the other side. it is a passive process, as no external energy is required