physiology 1-heart-physiology
Post on 25-Jan-2017
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Properties of Cardiac Muscle
• Excitability• Conductivity• Contractility• Automaticity
0. quick depolarization1.Quick initial repolarization2. Platoe phase3. Quick final repolarization
4. Slow diastolic depolarization (SDD)Develops in pace-makers during heart diastole
4.Slow diastolic depolarization (SDD)Develops in pace-makers during heart diastole
The dynamics of changing in cardiac muscle excita-bility (3), compared withphases of contraction (1)and excitation (2).A - absolute refractory phaseB - relative refractory phaseC - period of supernormality
A - sinus extrasystole B - ventricular extrasystole CP - compensatory ventricular pause
Cardiac cycle• Atrium systole + ventricle
systole + common pause• duration = 1 minute/ bpm
ATRIAL SYSTOLE 0,1sec
Ventricle systole 0,33sec
VENTRICLE SYSTOLE 0,33sec
VENTRICLE SYSTOLE 0,33sec
COMMON PAUSE 0,37sec
COMMON PAUSE 0,37sec
COMMON PAUSE 0,37sec
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