| A | B |
|---|
| Arteries carry blood | Away from the heart |
| veINs carry blood | INto the heart |
| arteries have | a small lumen and thick walls |
| veins have | a large lumen and narrow walls |
| capillaries are | 1 cell thick |
| valves | prevent backflow of blood |
| erythrocytes | red blood cells |
| plasma | the liquid part of the blood |
| red blood cells | contain haemoglobin |
| haemoglobin | carries oxygen |
| white blood cells which produce antibodies | lymphocytes |
| white blood cells which engulf microbes | phagocytes |
| platelets are responsible for | blood clotting |
| a bi-concave shape | increases SA:V ratio |
| carry blood under high pressure | arteries |
| carry blood under low pressure | veins |
