The double circulatory system is a type of blood circulation system where the blood flows through the heart twice in one complete circuit around the body. In humans and other mammals, this system includes two separate loops: the pulmonary circuit and the systemic circuit. First, the blood travels from the heart to the lungs in the pulmonary circuit, where it picks up oxygen and releases carbon dioxide. Then, the oxygen-rich blood returns to the heart and is pumped out again through the systemic circuit to the rest of the body, delivering oxygen to cells and collecting waste products. This system is efficient because it ensures that blood is properly oxygenated before being sent to the body's tissues, supporting more active and energy-demanding lifestyles.
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