PSYO 1011 Lecture Notes - Lecture 5: Resting Potential, Channel Types, Membrane Potential

• School: Dalhousie University
• Department: Psychology
• Course: PSYO 1011
• Professor: Leanne Stevens,Shelley Adamo,Kevin Duffy,Jennifer Stamp

Document Summary

Housekeeping: continue with readings, quiz next week (september 25, videos for chapter 3. The equilibrium potential for an ion is: the membrane potential at which the electrical forces and osmotic. Forces are balanced and there is no net flow of ions across the membrane. In which direction will k+ probably move when its channel opens and the membrane potential is -70mv? (normal conditions) The concentration of k+ outside a typical neuron is reduced by . Equilibrium for k+ -90mv; membrane potential is -70mv. More positive or more negative: more negative, now need a stronger electrical force to balance out the chemical force. If we increase one force, we have to increase the other. 70mv, 90mv: 90mv, membrane potential will move to the equilibrium potential. The concentration of na+ outside the typical neuron is reduced by . Remember: sodium is always trying to go into the cell: more negative, decreased osmotic force.