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B
Both atria
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C
Both ventricles
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D
Left atria and left ventricle
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Solution
The correct option is A Right atria 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, whereas a bicuspid or mitral valve guards the opening between the left atrium and the left ventricle.