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

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