Diffusion Flashcards
1
Q
Describe Diffusion?
A
Substances spontaneously move from regions of higher concentration to regions of lower concentrations.
2
Q
What is diffusion also known as?
A
Simple diffusion.
3
Q
What are regions of higher and lower concentrations known as?
A
Gradients.
4
Q
What are rates of diffusion influenced by?
A
Kinetic energy, molecular size and temperature.
5
Q
When will a cell membrane allow substances to diffuse in and out of them?
A
a cell will only allow this to occur when a cell membrane is permeable to that substance.
6
Q
What is Facilitated Diffusion?
A
- A type of facilitated transport
- Passive movement of molecules along their concentration gradient
- guided by the presence of another molecule, usually an integral membrane protein forming a pore or channel.
