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Single Circulation

Blood enters ...

Question

Blood enters into heart due to

A

Contraction of atrium

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B

contraction of ventricle

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C

relaxation of atrium

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D

relaxation of ventricle

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Solution

The correct option is C
relaxation of atrium

Along with other factors, relaxation of atrium creates a negative pressure within the atrium thereby contributing to drainage of blood from the veins into their respective chambers.

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