PSYB65H3 Lecture Notes - Lecture 4: Voltmeter, Resting Potential, Neurotransmitter

• School: UTSC
• Department: Psychology
• Course: PSYB65H3
• Professor: Zachariah Campbell

Document Summary

Electricity & electrical stimulation: electricity flow of e- form body that contains a higher charge (more e-) to body of lower charge (less e-, negative pole source of e-; higher charge. Resting potential: resting potential electrical charge across cell membrn in absence of stimulation. E inside the cell relative to extracellular side: in which: more e- inside than outside, @ rest: -70mv inside, 0mv outside. 4 charged particles take part in producing resting potential: sodium (na+) & chloride (cl-) Higher conc outside cell (axon: potassium (k+) & large proteins (a-) Graded potential: hyperpolarization increase in e- charge across membrn (more neg. , usually due to inward flow of chloride ions / outward flow of k+ ions, i. e. 70mv (cid:0) -80 (cid:0) -90: opening up of k+ gated channels = slow, depolarization decrease in electrical charge across membrn (more pos. , usually due to inward flow of sodium via channel shape change ( (cid:0) open, i. e.