PSY 352 Lecture Notes - Lecture 5: Electric Charge, Citral, Action Potential
Document Summary
Difference in charge between two regions allows flow of current if connected: opposite charges attract, similar charges repel. Ions move from an area of higher charge to an area of lower charge. Equilibrium occurs when the ion concentration is balanced. Potential: the ability to use stored power. Electrical charge across the cell membrane in the absence of stimulation. A store of negative energy on the intracellular side relative to the extracellular side. Inside of the membrane at rest is -70 millivolts relative to the extracellular side. Four charged particles take part in producing the resting potential. Outside cell sodium (na+) and chloride (cl-) Inside cell potassium (k+) and large proteins (a-) Large a- molecules cannot leave cell: make inside negative. Ungated channels allow k+ and cl- to move into and out of cell more freely, but gated sodium channels keep out na+ ions. Na+-k+ pumps extrude na+ from intracellular fluid and inject k+
