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

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