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

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