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在成人血细胞中除属于白细胞的淋巴细胞外,均是由其各自的前体细胞于骨髓中生成的。最幼稚的前体细胞是多能造血干细胞,继之分化成各细胞系的造血干细胞。干细胞不伴有成熟分裂,而是具有自我复制能力的未分化细胞。对此不论什么刺激,如对红细胞系有刺激,便在促红细胞生成素的作用下,分化成原红细胞,进而反复分裂成大量的红细胞,输送到血液中。白细胞和血小板也存在着类似过程,这些细胞在血液中达到一定的寿命后便崩溃并被处理。细胞中的各种物质,一部分被排泄,其余的被贮存或原样被再利用。正常情况下,由于崩溃的细胞与生成的细胞保持平衡,所以在末梢血中维持恒定的数量。当崩溃的细胞增多或
In addition to the lymphocytes belonging to white blood cells in adult blood cells are generated by their respective precursor cells in the bone marrow. The most naive precursor cells are pluripotent hematopoietic stem cells, followed by hematopoietic stem cells that differentiate into individual cell lines. Stem cells are not associated with mature division, but with undifferentiated cells capable of self-replication. No matter what stimulus, such as stimulation of the erythrocyte line, in the role of erythropoietin, differentiated into the original red blood cells, and then repeatedly split into a large number of red blood cells, transported to the blood. A similar process exists for leukocytes and platelets, which collapses and is processed after reaching a certain lifespan in the bloodstream. A variety of substances in the cell are partly excreted and the rest are stored or reused as they are. Normally, a constant amount is maintained in peripheral blood due to the breakdown of the cells in equilibrium with the resulting cells. When the collapsed cells increase or