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

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