Electrical Conduction of the heart
The heart is an organ that pumps blood around the body that delivers oxygen to vital cells that undergo respiration. It is split into 4 chambers: Left Atria, Right Atria Left ventricle and right ventricle. When looking at diagrams the wall of the left ventricle is much thicker as the heart has to pump with more pressure to deliver blood around the body.
The rhythm of the heart is controlled by nerve impulse - Electrical excitation. Pacemaker cells are involved in controlling the rhythm of contraction. These are patches of specialised cells that control the contraction of the heart, consisting of SAN - (Sinoatrial Node) and AVN - (Atrioventricular Node). The Cardiac muscles that are found are known a: Myogenic meaning that they can contract on its own. Pacemakers SAN and AVN helps with the initiation and coordination of the heart.
Heart’s Electrical Conduction System
There is a short delay between SN and AVN which ensures that the atria has fully contracted and all the blood has gone to the ventricles. Otherwise if Atria and ventricles contract at the same time then blood will keep flowing up and down and won't leave the heart. However when pacemaker cells don’t work then we can have artificial pacemakers that can help with initiation and coordination with the heart.
The movements or the Electrical Activity can be monitored by doctors using an Electrocardiogram (ECG). Doctors can also check for any abnormalities in the rhythm of the heart beat.