01 DEFINITION Transport and exchange of oxygen and carbon dioxide Blood exchanges oxygen and carbon dioxide between the body and the external environment. The exchange of gases takes place in the lungs during pulmonary circulation. Haemoglobin present in the blood helps in the exchange of both these gases. 02 DEFINITION Oxyhaemoglobin and carbaminohemoglobin Oxyhaemoglobin Oxyhaemoglobin is the bright red, oxygenated form of haemoglobin in the red blood cells, in which a molecule of oxygen has attached itself reversibly to the iron atom in the haemoglobin molecule. Oxyhaemoglobin transports oxygen from the lungs to the tissues. Carbaminohaemoglobin Carbaminohaemoglobin is formed when haemoglobin binds to carbon dioxide. It carries 10 % of the total carbon dioxide in the body. Haemoglobin has an affinity towards both oxygen and carbon dioxide. Hence after transporting oxygen to the tissues it can bind to carbon dioxide in the tissues a...
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