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Systemic circulation: It worked by the left ventricle, which is used to send the blood into the aorta and to supply oxygenated blood to the various parts of the body. This blood is collected by the venules, which further joins to form veins and pour blood to the right auricle of blood. So this circulation starts from the left ventricle to the right auricle.

Pulmonary circulation: It is different from the systemic circulation and starts from the right ventricle and reaches to the left auricle of the heart.