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

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