01:830:313 Lecture Notes - Lecture 3: Myelin, Area Postrema
Document Summary
No gaps in capillary in brain (smaller chemicals could enter: one part of the brain has capillaries (for vomit reflex, area postrema. Types and functions of intercalated proteins: ions channels: allow charged ions to flow into or out of neuron, cations: positively charged particles +++++++++, anions: negatively charged ions, transporters, detectors. Forces that move particles in the universe: electrostatic pressure: charged particles are attracted to opposite charge, electrostatic gradient, diffusion pressure: attracted to lower concentrated area, concentration gradient. Keg e. g. electrostatic gradient: people want to drink so they go to the kitchen, concentration gradient, there are a lot of people in the kitchen so you leave to go to the living room. Concentration gradient= go to where there is less of you. Depolarization is when particle becomes less negative (makes neuron fire) Cable or passive properties of conduction: decremental: amount of depolarization decreases as it moves away from membrane/ axon.
