Diffusion

  • Created by: samya_
  • Created on: 10-12-17 14:16
What is the definition of Diffusion? "Passive movement"
The net movement of particles (molecules/ ions) from a region where they are more highly concentrated to one where their concentration is lower until THE PARTICLES evenly distributed throughout the liquid or gas
1 of 15
What is "simple" Diffusion?
When molecules diffuse directly through a cell membrane from high concentration to low concentration
2 of 15
What are the Factors of "Simple" Diffusion?
* NO carrier Protein required * particles diffuse down conc gradient *Diffusion is a passive process(no energy neeeded)
3 of 15
Where will the net movement of diffusion always be?
Molecules will diffuse both ways, but the net movement will be to area of low conc. This continues until particles are gently distributed throughout liq/gas
4 of 15
What is concentration gradient?
The path from an area of higher concentration to an area of lower concentration
5 of 15
Is Non-polar soluble in lipids ?
YES! If something is non-polar it is soluble in lipids, so can dissolve in hydrophobic bilayer
6 of 15
Are charged particles Water soluble?
YES! So cannot diffuse through centre of bilayer therefore diffuse through channel Proteins
7 of 15
Factors of Faciliated Diffusion?
1) passive process 2) carrier + channel Proteins required to allow large/charged molecules to diffuse through
8 of 15
What do carrier Proteins do?
Move large molecules across Membranes down their concentration gradient. Difffernt carrier Proteins facilitate different molecules
9 of 15
How do Carrier proteins work?
1) FIRST large molecule attaches to carrier protein in Membrane (binding site) 2) THE protein changes shape 3) this release the molecules on the other side of membrane
10 of 15
What do channel Proteins form?
Water filled tubes to allow water-soluble ions to diffuse across the membrane
11 of 15
How do channel Proteins work?
Channel Proteins form pores in membrane to allow charge particles to diffuse through . Different channel Proteins facilitate Diffusion of different charged particles
12 of 15
What 3 things does simple diffusion depend on? (Use Notes explain
1) concentration gradient 2) Thuchkness of excngae surface 3) Surface Area
13 of 15
what 2 things does Faicliated diffusion depend on?
1) con gradient 2) Numbeor channel/carrier Proteins (once all Proteins in use Diffusion cannot take place any faster)
14 of 15
What is FICKS LAW
Rate of Diffusion= surface area X Conc gradient / Diffusiojndistrnave
15 of 15

Other cards in this set

Card 2

Front

What is "simple" Diffusion?

Back

When molecules diffuse directly through a cell membrane from high concentration to low concentration

Card 3

Front

What are the Factors of "Simple" Diffusion?

Back

Preview of the front of card 3

Card 4

Front

Where will the net movement of diffusion always be?

Back

Preview of the front of card 4

Card 5

Front

What is concentration gradient?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cellular processes resources »