Describe double circulation in human beings. Why is it necessary? explain the machanism of heart in human beings?
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double circulation is passing of blood twice in the heart. heart has 4 parts . left and right side is separated by septum. upper and lower part is separated by valves to prevent backflow of blood. upper parts are left auricle and right auricle. lower parts are left ventricle and right ventricle.
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Explanation:
During a single cycle, blood goes twice in the heart, known as double circulation. Humans must separate oxygenated and de-oxygenated blood because this makes their regulatory system more efficient and helps maintain constant body temperature.
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