one minite of heart is called
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Each beat is caused by the contraction (squeezing) of your heart. If you want to find out what your heart rate is, use a watch with a second hand and count how many beats you feel in 1 minute. When you are resting, you will probably feel between 70 and 100 beats per minute.
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The 'heartbeat' is in fact an electric beat produced by the SA node around 60-100 times a minute. 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.
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