SA node
The sinoatrial node triggers an impulse
The Sinoatrial Node sends a wave of electric impulses through the heart, which causes both atria to contract.
SA node sends an impulse for the atria to contract. AV node is then activated which contracts the ventricles.
The heart beats regularly because it has it's own pacemaker. The pacemaker is a small region of muscle called the sinoatrial, or SA, node. It is in the upper back wall of the right atrium. The node triggers an impulse that causes both atrium to contract. Very quickly, the impulse reaches the atrioventricular, or AV, node at the bottom of the right atrium. Immediately, the atrioventricular node triggers an impulse that causes both ventricles to contract.
The sinoatrial (S-A) node is known as the heart's natural pacemaker. It generates electrical impulses that set the pace for the heartbeat by initiating each electrical signal that triggers the heart muscle to contract. This ensures the heart beats at a regular rhythm.
The Heart's own pace makerThe heart beats regularly because it has it's own pacemaker. The pacemaker is a small region of muscle called the sinoatrial, or SA, node. It is in the upper back wall of the right atrium. The node triggers an impulse that causes both atrium to contract. Very quickly, the impulse reaches the atrioventricular, or AV, node at the bottom of the right atrium. Immediately, the atrioventricular node triggers an impulse that causes both ventricles to contract.
It is supposed to be the sinus node and the conducting tissue. It includes the AV node and bundle of HIS. The sinus node generate the impulse in the heart for contraction. The AV node and bundle of HIS transmits the impulse to the ventricles.
The AV node sends out an electrical impulse that causes the heart to contract.
An impulse travels through the heart by moving from the sinoatrial (SA) node to the atrioventricular (AV) node, then through the bundle of His, the bundle branches, and finally to the Purkinje fibers. This pathway coordinates the contraction of the heart muscle, leading to a synchronized heartbeat.
The electrical impulse in the heart begins in the sinoatrial (SA) node and travels across the walls of the right atrium to the atrioventricular (AV) node. WHie the impulse travels the atria have time to contract. Once the impulse hits the AV node the signal is transmitted to the Bundle of His (AV bundle) and then on the the intraventricular fibers (purkinje fibers) in the septum and the outer chamber walls of the heart . This results in a simultaneous ventricular contraction.
Sinoatrial, or SA node.
The sinoatrial node is impulse generating tissue in the (R) atrium of the heart. It is the natural pacemaker of the heart.