In rabbit, the opening of post caval in the right auricle is guarded by

Bicuspid valve

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Tricuspid valve

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Eustachian valve

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Sino-auricular valve

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Solution

The correct option is C Eustachian valve
The valve of the inferior vena cava that lies at the junction of the inferior vena cava and right atrium is known as the eustachian valve. In fetal life, the eustachian valve helps direct the flow of oxygen-rich blood through the right atrium into the left atrium and away from the right ventricle.

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