The heart is a special involuntary muscle called the cardiac muscle. Involuntary muscles keep working on their own without our intervention or effort.

The heart is divided into two sides divided by the septum. Each side has two chambers – a ventricle and an attrium. The left side of the heart is responsible for pumping the oxygenated blood from the lungs to the rest of the body. The right side of the heart is responsible for bringing the deoxygenated blood back to the lungs.

The heart keeps beating rhythmically using an electrical signal from the sinoatrial node located at the top of the heart. An electrocardiograph machine can record these electric impulses to study the performance of the heart.

The heart is a very important part of the circulatory system. If a part of the blood is lost, one can survive as the blood can get regenerated very quickly. However, any damage to the heart can be fatal. The heart is made up of involuntary cardiac muscles that keep the heart beating without any manual intervention as long as it remains healthy.