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QRS complex represents

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Important Questions on Body Fluids and Circulation

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In an ECG, the depolarization of atria is indicated by
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The artery can be distinguished from the vein in having
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The pulse rate is measured by feeling a/an
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Blood vessel carrying blood from lung to the heart is

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Which of the following has no muscular walls?
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The organ considered as “Graveyard of RBCs” is