The normal range of heartbeat is between 60 and 100 beats per minute. After the heart forms during fetal life and until the end of life, the heart continues to beat non-stop 24 hours a day, similar to an engine, to maintain blood circulation. Every time the heart beats, it indicates one contraction. The doctor can clearly hear the heart beating by using a stethoscope, placed in the forehead area where the heart is located. The heartbeat can also be monitored and evaluated by touching the superficial blood vessels in the wrist and neck and measuring the pulse. In a normal person, the heart beats in a uniform rhythm and beats strongly. The frequency of beats per minute is not fixed, but is related to the state of the body. The heartbeat slows down during rest, calmness and sleep, and increases during wakefulness, exercise, stress and excitement.