BLG 10A/B Lecture Notes - Lecture 3: Tight Junction, Lipid Bilayer, Brownian Motion
Document Summary
Passive transport substances move with their energy gradient (from high to low) across the membrane. And the membrane is impermeable, or poorly permeable, to the solute,// (water will move low to high solute env ) so a net (directional) movement of water occurs until equilibrium (a balance) is reached. Aquaporins = specific water channels that allow water to move freely through them. //(developing spikes) (wrinkles) // water will move out to dilute the solution and the cell will shrink. Active membrane transport requires energy input from the cell in order to move substances across the plasma membrane and includes: active transport and vesicular transport. 3. 1) = carriers that directly use atp hydrolysis to pump all transported substances against their concentration gradient have atpase in their name and include single ion pumps e. g. ca++atpase and h+atpase and multiple ions pumps. Na+-k+ atpase (sodium-potassium pump) = most important pump in the body.
