The opening of postcaval in mammalian heart is guarded by
A
Semilunar valves
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B
Bicuspid valve
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C
Tricuspid valve
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D
Eustachiun valve
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Solution
The correct option is B Eustachiun 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.