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प्रश्न
What is meant by 'heart beat'? What is the usual heart beat rate at rest?
टिप्पणी लिखिए
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उत्तर
Heart beat is the rhythmic contraction and relaxation of the heart, which includes one systole (contraction phase) and one diastole (relaxation phase) of the heart. At rest, human heart usually beats 70 to 72 times per minute.
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