ANP 1106 Lecture Notes - Lecture 10: Active Transport, Axon Hillock, Membrane Potential

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Joanne Savory

Document Summary

Neurons are excitable responsive to stimuli by showing depolarization. Action potentials (aps) (nerve impulses) generated in the cell body (axon hillock) & carried down the axon. = based on revisable electrical potentials across the axon membrane. Molecules in the body (na+, k+, ca++, cl-) are electrically charged. There ions are unevenly distributed throughout the cells in our body. This uneven distribution of charged = charge separation = potential e (voltage) Voltage: energy that is created by charge separation (i. e. across the cell membrane) measured between 2 pnts (a &b), called potential. Biological potentials have voltages ranging from -90 to -70 but under special circumstances can jump for a sec up to +55 miliivolts (mv) i. e. reversible electrical potentials. The flow of charge from point a to b = b/c of potential current. Amount of currnet that flows between a & b depends on the resistance (impediment of current flow) Ohms law: current (i) = voltage (v) / resistance (r)