differentiate between ststone and diastole explain the conduction of heart best .

Explanation

conduction of heart beat :
(I ) Human heart is myogenic in nature .
(ii ) Human heart is myogenic in nature .
(ii ) contraction is initiated by a specialized muscle , the sino - Atrial (SA ) noda Which is situated in the wall of the right atrium near the opening of the puperior vena cave .
(iii ) The SA node is broad at the top and tapering below . It is made up of thin fibres .
(iv ) SA noda acts as the ' Pacemaker ' of the heart because it is capable of initiating impulse which can stimulate the heart muscles to contract .
(v ) impluse from the SA noda spreads as a wave of contraction over the right and left Atrial wall pusing the blood through the atrioventricular valces into the ventricles .
(vi ) The wave of contraction from SA node reaches the atrio Ventricular (AV ) node which is stimulated to emit an impulse of contraction spreading to the ventricular muscle via the atrioventricular bundle and the purkinje fibres .