MEDICAL PHYSIOLOGY

Detailed explanation-1: -From the SA node, AVN conducts the action potential from the atria to the ventricles. Therefore through SA node and AVN, the action potential is conducted from the atria to ventricles. The cardiac cycle is the human heart’s performance from the end of one heartbeat to the start of the next.

Detailed explanation-2: -The wave of excitation from the sino-atrial node (SA node) stimulates the atrio-ventricular node, thereby leading to the contraction of ventricles through the bundle of His and Purkinje fibres. Hence, the atrio-ventricular node and the atrioventricular bundle play a role in the contraction of ventricles.

Detailed explanation-3: -[1] After electrical impulse is sent from the sinoatrial (SA) node to the atrioventricular (AV) node, the bundle of His quickly transmits the impulse to the left and right bundle branches and into the ventricles, resulting in a synchronized contraction of the ventricles.

Detailed explanation-4: -The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction.