BIO304H5 Study Guide - Bioelectromagnetics, Membrane Potential, Rush Hour
Document Summary
Membrane channel - extremely specific; passive vs active; allows cells to change its internal condition. Neuron membrane- pull out patches to see how it works. Neurons work as a network; allows quick communication across the body, developed because our size increased so need quick communication. Bioelectricity (inexpensive, fast, short-term); created by channels: system of nerve cells developed before humans so we can use models (squids, earthworm) because they are simple system (not as many nerve cells) Electrical model of cell membrane: membranes possess a potential (v) intracellular potential is ve relative to extracellular; membrane : keeps outside + inside. > vmemb =have potential that results in movement of: current encounters resistance (r. )->as +ve charges move inside cell, it encounters r. > molecules pile up due to high resistance; so few can get: biological systems use potentials as triggers ex. channels, muscle contraction. So electricity -> causes potential -> causes trigger.
