This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Simple diffusion is the movement of particles across a membrane from an area of high concentration to an area of low concentration (down or with the co ce t at o gradient concentration g ad e t) gradient) t) Small, uncharged solutes most gases, lipids Plasma Membrane and Transport 4 BIO 201 Proteins allow small solutes across cell membrane (like a door) Solutes still move down concentration gradient Facilitated Diffusion Charged particles (ions, amino acids, nucleotides)
Ligand Receptor Pores Channels Carriers Osmosis Movement of water through a selectively permeable membrane from an area of more water to an area of less water from an area of less solutes to an area of more solutes Aquaporins are channel proteins in cell membrane that allow water to move freely in or out of the cell (determined by tonicity of solution) ( y y ) Plasma Membrane and Transport 5 BIO 201 Active Transport Protein-mediated, Protein-mediated, active transport of solute across membrane against its concent...
View Full Document
This note was uploaded on 05/18/2010 for the course BIO 201 taught by Professor Oberstein during the Spring '08 term at ASU.
- Spring '08