2.3.3 Hartspiercel vs. skeletspiercel
Hartspiercel Skeletspiercel
Contractie start bij depolarisatie Contractie begint bij einde repolarisatie
Refractieperiode Snel afgelopen
= tijd wanneer cel geen nieuwe prikkel kan
ontvangen
Geen nieuwe prikkel al opnemen Nieuwe prikkel al opnemen
Summatie ONmogelijk Summatie mogelijk
2. AV-knoop (vice-gangmaker vh hart)
- Gestimuleerd door actiepotentiaal SA-knoop of
spontaan depolariseren
- Vertraging (“pauze”)
➔ Artria tijd nodig om samen te trekken +
verplaatsing bloed artria naar ventrikels
3. Bundel van His
- Splitsing linker- en rechterbundel tak
4. Purkinje vezels
5. Contractiele cellen
➔ Contractie ventrikels
2.4.2 Hartcyclus
• = periode beging hartslag tot volgende
• 2 delen
➔ SYSTOLE = contractiefase
➔ DIASTOLE = ontspanningsfase
(aparte cycli voor atria x ventrikels)
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