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Give reason.. After their lifespan rbcs.. Are haemolysed even then the count remains same

Dear student,
Although RBCs has an average lifetime of 120 days, RBCs are continuously produced in the erythropoietic cells of the red bone marrow in adult human beings. So lost or haemolysed RBCs are continuously replaced by new ones. Hence mature RBC count in blood remains more or less same always.

Regards.

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RBCs are formed in the red bone marrow in the adults.They have an average life span of 120 days after which they are destroyed in the spleen. The process of formation of RBCs is known as erythropoesis. Erythropoesis is a continuous process which runs every minute.Not all RBCs of the body are formed and destroyed at the same time. Old RBCs are exchanged with the new one so that there is enough amount of RBCs in the blood.
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