Blood enters the heart because muscles of the ___________.

Atrium contracts

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Atrium relaxes

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Ventricle relaxes

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Ventricle contracts

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Solution

The correct option is B Atrium relaxes
Blood enters from the superior and inferior venae cavae into the right atrium during the relaxation phase of the atrium. The pressure difference between the venae cavae and inside chamber of the right atrium allows the deoxygenated blood to enter the heart.
So, the correct answer is option 'B'.

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