RED BLOOD CELLS | WHITE BLOOD CELLS |
1) They are called erythrocytes. | 1) They are called leucocyytes. |
2) Its main function is to carry oxygen from the lungs to the body tissues and carbon dioxide (the waste product) away from the tissues and back to the lungs. | 2) They are the cells of the immune system which help to protect the body against infectious disease and foreign invaders. |