During joint diastole,

both the auricles receive oxygenated blood

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tricuspid valve and mitral valve remain closed

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semilunar valves open and dub sound is heard

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left atrium receives oxygenated blood through pulmonary veins

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Solution

The correct option is D left atrium receives oxygenated blood through pulmonary veins
During joint diastole, tricuspid and bicuspid valves are open. It is at this point the blood from the pulmonary veins and vena cava flows in to the left ventricle and right ventricle through the atria. So, left atrium receives oxygenated blood through pulmonary veins.

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