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B
Right auricle and right ventricle
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C
Left ventricle and left auricle
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D
Ventricle and aorta
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Solution
The correct option is D Right auricle and right ventricle
The opening between the right atrium and the right ventricle is guarded by a valve formed of three muscular flaps or cusps, the tricuspid valve. It is also called as an atrioventricular valve. It prevents the backflow of blood into the right atrium. Whereas a bicuspid valve guards the opening between the left atrium and the left ventricle.