Deoxygenated blood returns to the right side of the heart via the vena cava., Deoxygenated blood enters the right atrium, Deoxygenated blood is ejected through the tricuspid valve into the right ventricle., The right ventricle contracts and ejects deoxygenated blood through the pulmonary artery., Blood is sent through the pulmonary circulation pathway., Oxygenated blood from the lungs returns to the left side of the heart via pulmonary veins., Oxygenated blood enters the left atrium., Oxygenated blood is ejected through the mitral valve into the left ventricle., The left ventricle contracts and ejects oxygenated blood through the aorta., Blood is sent round the systemic circulation pathway..

Circulation

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