in microscopic world, countless vibrant erythrocytes, red blood cells, traverse circulatory system, tirelessly carrying

hypochromic ironrich lifespan anemia macrocytes rbcs hematologist iron hematopoiesis cell oxygenation blood bloodrelated health hemoglobin heme capillaries oxygencarrying morphology red hematocrit erythrocytes hematology medical microcytes bloodstream erythropoiesis normocytic erythrocyte ai generated