IMED1001 Study Guide - Final Guide: Theodor Schwann, Phase Velocity, Axon Hillock
Document Summary
Action potentials do not diminish over distance, they spread from one membrane microdomain to the next membrane microdomain. Neurone soma (50 to 75 gates per m2 ); Refractory membrane ensures that action potential travels in one direction. Neurones & muscle cells have a lot of surface area! Muscles in your feet are almost 2 m from your brain Other cells wrap around soma nucleus nerve cells, so i"ll name these cells after myself. So i"ll name the gaps between these lumps after myself = nodes of ranvier . Gaps between myelin are the only places where aps can occur. They jump from one nor to the next. Approximately 10,000 schwann cells per metre of axon length. Cells maintain an icf high in k+ and very low in na+ Selective movement of ions across a plasma membrane. Carry electrical signals in nerve and muscle cells.
