PROPERTIES OF PROPERTIES OF CARDIAC MUSCLES.CARDIAC MUSCLES.

ELECTRICAL PROPERTIESELECTRICAL PROPERTIES

EXCITABILITY(RMP,AP,PP)EXCITABILITY(RMP,AP,PP)CONDUCTIVITYCONDUCTIVITY

AUTORYTHMICITYAUTORYTHMICITY(STANNIUS LIGATURE)(STANNIUS LIGATURE)(Idioventricular rhythm).(Idioventricular rhythm).

RMP AND APRMP AND AP

STRUCTURE OF CARDIAC STRUCTURE OF CARDIAC MUSCLEMUSCLE

AUTORHYTHMICITYAUTORHYTHMICITY

MECHANICAL PROPERTIESMECHANICAL PROPERTIES1.CONTRACTILITY1.CONTRACTILITY

2.ALL OR NONE LAW.2.ALL OR NONE LAW.3.REFRACTORY PERIOD. 3.REFRACTORY PERIOD.

(ARP,RRP,ES,CP,PEP)(ARP,RRP,ES,CP,PEP)4.STAIRCASE PHENOMENON.4.STAIRCASE PHENOMENON.

5.LENGTH TENSION RELATION. (Frank-5.LENGTH TENSION RELATION. (Frank-Starlings law).Starlings law).

6.FORCE VELOCITY RELATION. (Increase 6.FORCE VELOCITY RELATION. (Increase load leads to decreased velocity of load leads to decreased velocity of

shortening).shortening).

STANNIUS LIGATURESTANNIUS LIGATURE

REFRACTORY PERIODREFRACTORY PERIOD

CIRCULATIONCIRCULATION

VESSELSVESSELS

ALL OR NONE LAW.ALL OR NONE LAW.

EXTRASYSTOLE.EXTRASYSTOLE.

STAIRCASE STAIRCASE PHENOMENON.PHENOMENON.

LOAD-VELOCITYLOAD-VELOCITY

VESSEL WALLVESSEL WALL