PHGY 214 Lecture Notes - Lecture 2: Sodium-Potassium Alloy, Procaine, Cell Membrane

• School: Queen's University
• Department: Physiology
• Course: PHGY 214
• Professor: Shetuan Zhang

Document Summary

1. the relative solubility of the particle in lipid. High lipid soluble particles can dissolve in lipid bilayer (steroid, fat) Uncharged or non-polar molecules readily permeate the membrane (gases like oxygen, carbon dioxide) * water soluble solutes like ion, sugar, and amino acids cross by carriers, pumps, or channels: the size of the particle. * movement determined by solute concentration gradient or electrical gradient. No ener- gy is required for passive movement. Osmosis aquaporins - channels used for the passage of water (are formed by membrane proteins) is the same concept as diffusion except for water. Water moves by osmosis to the area of higher solute concentration. Osmosis when membrane separates unequal solutions of solute if membrane permits passage of both water and solute solute and water move down its own concentration gradients till equilibrium. Solutions of non penetrating solute water move down its concentration gradient solute unable to move water and solute concentrations equal out but volumes are not.