Fast and slow action potentials

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  • Created by: cat
  • Created on: 06-05-15 16:35

Slow response action potentials: i.e SAN 

(http://www.pierluigimasini.it/emurg/wp-content/uploads/2013/01/potenziale-azione-miocardio.jpg)

NOTE: LOOK AT RIGHT PICTURE

Phases of SAN action potential

Phase 4: gradual spontaneous depolarisation = pacemaker potential 

  • Decays from -60mV to -40mV due to:
  • less potassium ionss flowing out though potassium channels.and a slow inward movement of sodium ions and calcium ions. 

Phase 0: more repid depolarisation due to:

  • calcium entry through voltage-operated calcium channels [T-type and

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