PSYC 3670 Lecture Notes - Lecture 3: Axon Hillock, Membrane Potential, Resting Potential

• School: York University
• Department: Psychology
• Course: PSYC 3670
• Professor: Kristoffer Romero

Document Summary

Neurophysiology: study of the life processes of neurons. Polarized: di erence in electrical charge (every cell is more negative on the inside & more positive outside) Anions: majority of the ions in the cell (negatively charged, ex: large proteins that don"t cross the membrane) Intracellular uid: cytoplasm - ions are dissolved in here. Extracellular uid: uid in the spaces between cells. Micro-electrode: small electrode used to record electrical potentials inside living cells. Resting potential: di erence in electrical potential across the membrane of a nerve cell at rest (-50 to -80 thousands of a volt/millivolts (mv) (typically -70mv) Ion channel(protein): pore in cell membrane that allows certain ions through the membrane. Selective permeability: property of membrane that allows some substances to pass through but not others (channels open with speci c voltage or key ex: neurotransmitter) Potassium ion (k+): potassium atom with positive charge (semipermeable ion channels selectively allow k+ to cross the membrane, having more inside cell than outside)