Sunday 13 April 2014

Biomedical [Basics] what is Action Potential?

Action Potential



Steps in Action Potential:
  1. Cell in its normal state (polarized cell) called Resting state block Na+ ions.
  2. So outside of Cell is positive wrt to inside. This potential is -70 mV
  3. When cell is stimulated the cell membrane momentarily allows Na+ ions.
  4. So inside of cell becomes positive (Depolarized cell). This is called action potential (20mV)
  5. Immediately after effect of stimulation ceases Na+ ions are transported back outside (Repolarized cell).
Conduction of action potential is rapid in mylinated axons.

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