动物生理学呼吸系统生理下.ppt

5.3.3 Transport of CO2 Carbon dioxide is stored in three forms in blood, in physical solution, as bicarbonate, and in combination with protein, as carbamino compound. 二氧化碳的运输（Transportation of CO2 物理溶解 （6％） CO2的运输 physical dissolution Transportation　　　　　　　　　　　　碳酸氢盐形式 of CO2 （87％） bicarbonate pattern 化合结合 （94％） combination 氨基甲酸血红蛋白 （7％ ） carbaminohemoglobin (1) Bicarbonate The greatest storage of CO2 in blood is the form of bicarbonate ion. CO2 is carried in plasma as dissolved CO2 and as bicarbonate and is carried inside red cell as dissolved CO2, bicarbonate, and carbaminohemoglobin. The formation of bicarbinte is extremely rapid because of the presence of carbonic anhydrase (CA), Hydrogen ion formed is buffered by hemoglobin, shifting the O2 equilibrium curve to the right, thus enhancing oxygen release. Because of the high intracellular concentration of bicarbonate, some bicarboonate is transported out into the plasma in exchange for plasma Cl-. 碳酸氢盐形式的运输 Transport in bicarbonate pattern 特点：character: 反应可逆，但需酶的促助。 Reaction is reversible. But it need the help of enzyme. 结合或解离决定于CO2分压差。 Conjugation or dissociation is decided by partial pressure difference of CO2. 反应中伴有Cl－的转移。 There is the transfer of Cl－ in the reaction. The uncatalyzed rate of forma