In mammals, the opening of the postcaval in the right auricle is guarded by

Mitral valve

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Thebesian valve

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Eustachian valve

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Bicuspid valve

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Solution

The correct option is C Eustachian valve
Valves are the membranous structure that prevents the backflow of the blood. The eustachian valve of the inferior vena cava or postcaval lies at the junction of the inferior vena cava and right atrium.
So, the correct answer is option C.

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Mitral valve in mammals guard the opening between

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