2. branches of the arteries which further branch into capillaries

3. the upper chambers of hte heart above the ventricles which pump blood into the ventricles

4. a heart valve of two flaps which separates the left auricle from the left ventricle

5. the groups into which an individual's blood may be classified

6. tiny pieces of broken cells with irregular shape found in the blood, mainly for blood clotting

7. the process of giving glood to a patient

8. the narrowest type of blood vessels with thin walls and connect the arteries to the veins. It is the place where gases and materials in the blood exchange with the body cells

9. the sequence of events that take place in one heart beat

10. a system which moves substances throughout the body

11. blood which has given up much of its oxygen

12. the red pigment inside red blood cells for carrying oxygen and carbon dioxide

13. muscles of the heart which can contract and relax continuously

14. string-like structures that hold the heart valves, preventing them from turning inside-out when the ventricles pump blood out of the heart

15. tissue fluid inside lymph capillaries and lymph vessels

16. tiny blind-ended blood vessels that collect excess tissue fluid and return them to the blood through lymph vessels and veins

17. swellings along lymph vessels for body defence

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