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

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