PSY 3061 Lecture Notes - Lecture 5: Resting Potential, Action Potential, Schwann Cell
Document Summary
Electrical gradient, positive are attracted to negative, but repel from other positives, charges wants to go inside/inward, sodium ions are low concentrated on inside, and high on outside. Sodium ions want to go inside of the cell: potassium ions want to move from inside to outside (higher concentration on inside rather than outside), sodium-potassium pump. Moves sodium outside, and potassium inside: sodium 3 of them get pumped out, potassium 2 of them get pumped in. Pump maintains balance but needs energy: neurons require so much energy because cells are constantly moving against gradients, active transport needs energy to transport particles against gradient. Ions are balanced while the neuron is at rest (resting potential): passive channel = leakage , allow potassium ions to move with their gradient. Action potential: post synaptic potentials (depolarized/hyperpolarized), threshold for given neuron at which an action potential can be generated. All or none event: an electrical impulse that propagates along the length of an axon.
