Cardiac Electrophysiology

Cardiac Electrophysiology

اسلاید 1: Cardiac ElectrophysiologyProvider:Master :

اسلاید 2: Three Major type of cardiac muscle fiber: 1- Atrial muscle 2- Ventricular muscle 3- Specialized excitatory and conductive muscle fibersPHYSIOLOGY OF CARDIAC MUSCLE

اسلاید 3: Atrial and ventricular muscle contract in a same way as skeletal muscle but the duration of contraction is longer The specialized excitatory and conductive fibers Contract feebly because they contain few contractile fibrils Exhibit automatic rhythmical electrical discharge in theform of action potentials

اسلاید 4: CARDIAC MUSCLE AS SYNCYTIUM

اسلاید 5: Intercalated discs are cell membranes that separate individual cardiac muscle cells from one another. At each intercalated disc there are communicating gap junctions that allow rapid diffusion of ions so that action potentials travel easily from one cardiac muscle cell to the next

اسلاید 6:

اسلاید 7: Phase 0 (rapid depolarization) External stimulus to excitable tissue opens the voltage gated sodium ion channels sodium ions enter the cells down their electrochemical gradient intracellular movement of sodium ion depolarizes the membrane increases the membrane conductance to sodium ion displaces the membrane potential to +30mV