31. Sketch the diagram of circulatory system with proper labeling and give a brief outline of the process of circulation by the hearts in human beings.
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The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.
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