| A | B |
|---|
| Needed substances are carried to the body cells by | blood |
| The function of the atria | receive blood that comes into the heart |
| Blood vessels that carry blood away from the heart | arteries |
| Where materials are exchanged between blood and cells | capillaries |
| blood pressure | force with which the ventricles contract |
| carries oxygen to the body cells | red blood cells |
| Platelets do this | clot blood |
| Blood types are determined by | marker molecules on red blood cells |
| function of lymph nodes | trap disease-causing bacteria |
| prevent blood from flowing backward | valves |
