Transcript Facilitated Diffusion - Ms. Ramirez's Biology Page
Facilitated Diffusion • Substances, that are too large or have too strong of a charge can still get across the cell membrane• How? Proteins act as tunnels or channels • This is still diffusion though, and does not require the cell’s energy- Example • Red blood cells: have a protein channel for glucose. • Only glucose can pass through this channel, and it can move through in either direction. • 100’s of different protein channels have been found that allow particular substances to cross different membranes.