1. CARDIAC MUSCLES AND CONDUCTIVE SYSTEM
1.ATRIAL MUSCLE
2.VENTRICULAR MUSCL
3.CONDUCTIVE FIBERS
A.SA NODE
B.AV NODE
C.INTERNODAL FIBERS
D.AV FIBERS (BUNDLE OF HIS)
E.LEFT AND RIGHT BUNDLE BRANCH
F.PURKIINJE FIBERS

2. Interatrial pathway Atrioventricular (AV) node Sinoatrial (SA) node
Right
atrium
Left
atrium
Internodal
pathway
Left
branch
of bundle
of His
FIGURE 9-7: Specialized conduction system of the heart.
Right
branch
of bundle
of His
Left
ventricle
Right
ventricle
Purkinje
fibers
Fig. 9-7, p. 247

3. Histology of cardiac muscle

5. Pacemaker activity of cardiac autorhythmic cells

6. Direction of ventricular excitation

7. ACTION POTENTIAL OF DIFFERENT PARTS OF THE HEART
1.PACE MAKER OF THE HEART SANODE
2.ATRIAL ACTION POTENTIAL
3.ACTION POTENTIAL OF THE VENTRICLES
4.DELAY IN THE AV NODE
5.HIGH VELOCITY IN THE PURKINJE FIBERS
6.REFRACTORY PERIOD
A.ABSOLUTE
B.RELATIVE

10. MEMBRANE POTENTIAL (mV)
PHASE
Mechanical Response
0 = Rapid Depolarization
(inward Na+ current) 1
1 = Overshoot 2
2 = Plateau
(inward Ca++ current)
3 = Repolarization
(outward K+ current)
MEMBRANE POTENTIAL (mV)
4 = Resting Potential 3 4
-90
TIME

11. ACTION POTENTIALS
VENTRICULULAR
CELL
SAN 1 2 3 3 4
-50
-50
MEMBRANE POTENTIAL (mV) 4
-100
-100

13. CONTROL OF EXITATION AND CONDUCTION
1-SYMPATHETIC
2-PARASYMPATHETIC
3-IONS