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What is heartbeat ?

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What is heartbeat ?

    • Posted by Mehak Preet Kaur Kaur 7 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Bhumika Sharma 7 years, 2 months ago

    While pumping the blood,the muscles of different chambers of heart contract and relax in turns. The contraction and relaxation of different chambers produce a thumping sound. This sound can be heard as heartbeat...

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