07. Facilitated diffusion

What do not pass through the cell membrane?

Charged particles, ions, large molecules (e.g. glucose) -> bc they’re insoluble in lipid

What do charged particles, ions and large molecules not do?

Pass through the cell membrane

What help such particles diffuse in and out?

Intrinsic proteins which span the membrane from one side to another

What do intrinsic proteins do?

Help such particles diffuse in and out

What type of intrinsic proteins help facilitate diffusion?

Channels or carriers

What are channels and carriers?

Proteins

How do carrier proteins and channels impact facilitated diffusion?

Increase rate of diffusion along conc. gradient without ATP

Draw the graph of facilitated diffusion

Yes

Describe the beginning of the facilitated diffusion graph?

Initial increased rate of diffusion as increased conc. gradient -> Channel + carrier proteins help

What happens at the end of the graph?

Rate of diffusion levels off at higher conc. -> Channel + carrier proteins saturated -> limits rate of diffusion

How do respiratory inhibitors affect facilitated diffusion?

No affect as ATP not needed

What factor does not impact facilitated diffusion?

Respiratory inhibitors