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Question : Describe double circulation in human beings. Whyis it necessary ? |
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Answer» Solution :Double CIRCULATION is thepassage of the same blook twice through the heart, first on the rightside then on THELEFT side in orderto complete one cycle. Double circulation has two components : Pulmonary circulation and systemic circulation . Pulmonary circulation - It is the movementof blood from heart to thelungs andback. De-oxygenatedblood of the body enters the rightartricle, passes into rights ventricle which pumpsit into pulmonary ARCH. Withthe help of twoseparate pulmonary arteriesthe blood passes into the lungs. Herethe arteries breakup into arterioles and then capillaries for oxygenation. Capllaries join to form ventricles and then veins. Oxygenated blook comes back to the left atrium of heart through pulmonary veins. Systemic circulation - It isthe circulation of bloodbetween heart and different PARTS of thebody except lungs. Oxygenatedbloodreceived by left atrium passesinto left ventricle. The left ventricle pumpsit intoaorta forsupply to different body parts. Inside the organs the arteriesbreak up into arterioles and then capillaries.Capillaries provide oxygen and nutrientsto tissues.Theyreceive carbon dioxide andwastes from the tissuces.receive carbon dioxide and wastes from the tissues.Capillaries UNITE to form venules which join to produceveins. Veinstakethe de-oxygenated blood to theheart but nowinto the rightatricle . Significance of double circulation - Itensures quick and efficientsupply of oxygenated blook to all body parts for meetinghigherenergy needs and forthermoregulation of body in mammalsand birds. 
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