What does the QRS wave represent in an ECG? from Biology Body F
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    Body Fluids and Circulations

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    How many times does a heart beat per minute?

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    12.

    What is the function of bicuspid valves?

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    13.

    What is the function of tricuspid valves?

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    14.

    Why circulatory system is absent in sponges?

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    15.

    What does the QRS wave represent in an ECG?

    Depolarisation of the ventricles.

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    16.

    Name a animal having open circulatory system.

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    17.

    What are vasa vasorum?

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    18.

    What is ECG?

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    19.

    What is Tachycardia?

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    20.

    Define Bradycardia.

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