Physiology 2130 Chapter Notes - Chapter 1: Electrochemical Gradient, Pressure Gradient, Osmotic Concentration

• School: Western University
• Department: Physiology
• Course: Physiology 2130
• Professor: Anita Woods

Document Summary

So molecules move from areas of higher concentration to areas of. The number of particles (ions or intact molecules) per litre of solution (units: osmol/l) Wednesday, september 23, 2015. Net movement of water down it"s concentration gradient. Pressure applied to exactly oppose the osmotic movement of water. Factors which affect the movement of water across membranes: permeability of the membrane, concentration gradients of solutes, pressure gradient across the cell membrane. Ability of a solution to cause osmosis across biological membranes. Causes cell to swell as water rushes in. 1 - osmosis, tonicity and the resting membrane. Causes swell to shrink as water rushes out. Movement of ions: molecules move down their concentration gradient. So molecules move from areas of higher concentration to areas of lower concentration: molecules move down their electrical gradient. Electrically charged molecules (ions) tend to move towards areas of opposite charge. Negatively charged molecules move towards positively charged areas charged areas.