The heart is indeed a biological miracle. Fist-sized, it pumps blood through the entire body for a whole life time, day and night. It is the blood which supplies nutrients and oxygen to the body. It is through the  blood  again,  that waste products and carbon-dioxide are removed from it. Ironically, we hardly notice the good  work of our heart, until it is sick. And when it is sick it could be too late.

Made of a special type of muscle, the heart has the remarkable capacity of beating on its own. While other muscles depend on the brain for movements, the heart has its own electrical impulse generator, which makes the heart beat about 60-80 times a minute at regular intervals. Irregular beats, fast or slow beats are called arrhythmia and require treatment.