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More than 2,000,000 (2 million) erythrocytes or red blood cells (RBCs) are produced in human adults each second!

Erythropoiesis is the process by which new RBCs are produced; evolving or maturing from a stem cell in nearly 7 days.

They develop in the bone marrow and stay active for 100 to 120 days in the adult body

$...$ before being 'recycled' by macrophages (leucocyte) in our bone marrow, liver and spleen ($lArr$here their destruction takes place.)

Approximately, $color(red)("half")$ of our blood's volume consists of of RBCs; moreover, $color(red)("one quarter")$ of our total amount of cells is made of RBCs.

Take into account that our liver is the main organ of RBC removal and iron recycling.

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