Histidine ( His) is one of the primary components of the hemachrome, with remarkable buffer effects at the pH value of intracellular fluid and blood. It is significant for erythrocyte to convey the oxygen and the carbon dioxide in blood. 组氨酸(His)是人体血红素的主要成份之一,在细胞内液和血液的pH值时有显著的缓冲效应,这对于红血球在血液中输送氧气和二氧化碳的功能是至关重要的。