2.6 Facilitated Diffusion

AP Biology

What is Facilitated Diffusion?

passive transport that requires a channel protein

What two ions specifically require channel proteins and what other things need channel proteins?

K+, Na+, and large polar molecules

What influences where or not membranes become polarized?

the movement of ions across membranes

What are aquaporins?

channel proteins that transport lots of water across the membrane 

Why can water molecules pass through the bilayer in small amounts?

because of how small of a molecule it is, it can fit through the cracks