Rhythmic beating of the various chambers of the heart maintain circulation of blood to the different parts of the body.
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The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen to every cell. After delivering the oxygen, the blood returns to the heart. The heart then sends the blood to the lungs to pick up more oxygen.
This normal rhythm of the heart is called as 'sinus rhythm' and can be felt as an external pulse. The electrical signal or electrical impulse produced by the heart can be recorded by placing electrodes on the chest. This is called an electrocardiogram (ECG or EKG)
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