PGY 300 Lecture Notes - Lecture 3: Active Transport, Electrochemical Gradient, Lipid Bilayer
6 Feb 2017
School
Department
Course
Professor
Document Summary
Selective of what it will let in/out. Things that are lipid soluble can permeate well. Things that are water soluble can"t permeate well. Pathway between outside and inside of cell. Factors affecting rate of diffusion through a cell membrane. Concentration difference between inside and outside of cell. Big difference fast rate of diffusion. Doesn"t control which way ion goes (moves along electrochemical gradient) Not a pore that goes straight through membrane. Open on side and closed on the other side. Slower for ions to pass through membrane. Energy comes from the electrochemical gradient created by pumping ions out of the cell (via primary active transport) Symport carrier moves two or more substrates in the same direction across membrane. Antiport carrier move substrates in opposite directions (na/k pump) Take out 3 na+ and put in 2 k+ make inside of cell less positive (more (cid:1445)negative(cid:1446)) Carries across neurotransmitter instead of glucose (for purpose of neurophysiology)
