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The deoxygenated blood returns to the heart through the inferior and superior [vena cava]. This blood enters into the [right atrium]. The right atrium [contracts] forcing blood through the [tricuspid valve] into the [right ventricle]. On the opposite side of the heart, oxygentated blood returns to the heart through the [pulmonary vein] into the [left atrium]. This blood enters the [left ventricle] through the [bicuspid valve]. This stage is called [diastole], which means the heart relaxes and fills with blood. .

Journey of the Blood

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