BIOL 306- Final Exam Guide - Comprehensive Notes for the exam ( 79 pages long!)

• School: McGill University
• Department: Biology
• Course: BIOL 306
• Professor: Alanna Watt Joseph Alan Dent

Document Summary

K na atpase is an energy source of neuron voltage, 2 outcomes. Membrane potential when there is no net ion movement, predicts equal ion concentration at both sides. Cell membrane, no pore, different ion concentration but same balanced charge. Opens potassium selective channel: net ion flow down the gradient, not a ion equilibrium state--flow of charges creates a voltage. Electromagnetism force balances concentration gradient: establish equilibrium potential (nernst equation) Ek of k roughly equals to resting potential. Nak atpase creates ion concentration gradients, opening of k channel converts it to. As it praoches the nernst potential, k concentration decreases 0. 000001% m. Closing k channels and open na channels until at 0mv. Atpase always maintains a ion gradient unless there is no atp. Determining force of the v depends on which ion is more permeable. Not a long term equilibirum, na and k both flow down the gradient, using up the energy, (only if atpase replenish as fast as they flow)