HLTH3410 Lecture Notes - Lecture 7: Neuromuscular Junction, Voltage, Motor Unit
Document Summary
Fundamentals of electricity: nerve and muscle cells can control the location and flow of charged particles in and out of the cell. Operation of this motor system" is based on four electrical concepts: 1. Work" must be done to bring together two charges that are initially separated. Current (a: amount / rate of positive charges that move between two locations (+ to -, - to +), representing a potential difference. In electronics, current is carried by electrons (between the two terminals (+ & -). In nerve and muscle cells, current is carried by ions in solution. Conductance ( ) & resistance (r: current capacity of a material, metal has high conductivity, or a high ability to transmit current (6. 3 x. 10 s/cm : within the nerve and muscle cells, ions have lower conductivity (50 . 500 s/cm ) although, we don"t need what is required to produce electricity!
