| Flap 1 | Flap 2 |
| cardiac muscle | heart |
| carry blood away from the heart | arteries |
| carry blood to the heart | veins |
| smallest blood vessels | capillaries |
| carry oxygen | red blood cells |
| fight infection | white blood cells |
| fight pathogens | antibodies |
| help the blood to clot | platelets |
| mineral which helps give red blood cells their color | iron |
| a blood clot on your skin | scab |
| upper chamber of the heart | atrium |
| lower chamber of the heart | ventricle |
| upper chambers of the heart | atria |
| little doorlike flap | valve |
| the continuous flow of blood around the body | circulation |
| heart, blood, arteries, capillaries, and veins | circulatory system |
| the largest artery in the body | aorta |
| expanding of the arteries after each heartbeat | pulse |
| two large veins which enter the heart | venae cavae |
| enlarged veins | varicose veins |
| pressure of your blood against the arteries | blood pressure |
