1. Which blood vessels (W, X, Y and Z) are veins? Y and Z

2. The circulatory system includes Blood Blood vessels Heart

3. Which blood vessels (W, X, Y and Z) carry oxygenated blood? W and Y

4. Artery carry blood ________ heart away from

5. Name valves X. Semilunar valve

6. What is X? Blood cells X

7. What is A? Red blood cells A B C

8. Made in Red bone marrow

9. Waste(e.g. and ) diffuse from the body cells to blood. Carbon dioxide, urea

10. Identify blood vessels P, R and T? P: artery, R: capillary, T: vein

11. Name chamber C. Left atrium

12. Name chamber B. Right ventricle

13. Blood platelet can help in Blood clotting to stop bleeding and prevent entry of germs

14. What is the shape of A? Biconcave disc shape A B C

15. Old red blood cell will broken down in Liver

16. Explain two ways how blood cell A is structurally adapted to its function. It does not contain nucleus so it has more space to carry more haemoglobin. It is biconcave disc shape so it has a large surface area to volume ratio. Oxygen can diffuse rapidly across the cell membrane. A B C

17. Main substance in plasma is water

18. Name blood vessel W. aorta

19. Compare the thickness of the wall of right and left ventricles. What is the significance of the difference? Left ventricle has thicker wall than right ventricle. Left ventricle can provide greater force to pump blood to all parts of the body except lungs whereasright ventricle pumps blood only for a short distance to the lungs.

20. Which of the following cannot found in plasma? a.Water b.Glucose c.Starch d.Protein a.Water b.Glucose c.Starch d.Protein

21. Name chamber D. Left ventricle

22. Name blood vessel Y. Pulmonary vein

23. Name Q. Septum

24. What is the function of B? Cell B produces antibodies to kill germs or neutralize toxins released by the germs. A B C

25. Explain why blood pressure changes periodically in aorta. The heart contracts and relax periodically.

26. Vein carry blood ________ heart towards

27. What is B? Lymphocyte A B C

28. What is the function of septum? Septum prevents the mixing of oxygenated blood and deoxygenated blood.

29. The _______ of capillary is one cell thick. wall

30. What is the function of valves in vein? Prevent the backflow of blood

31. Identify blood vessel A and B A is vein B is artery

32. Useful substances (e.g. and ) diffuse from the blood to the body cells. Glucose, amino acids

33. Explain why the capillary wall is only one-cell thick. It provides a short distance for rapid exchange of materials between the blood and the body cells by diffusion.

34. Blood platelet Made in Red bone marrow

35. Explain why the carpillaries are highly branched to form a network.. It provides a large surface area for rapid exchange of materials between the blood and the body cellsby diffusion.

36. Explain why blood pressure is very low in venae cavae. The blood has overcome great friction of the blood vessel walls after travelling a long distance.

37. Name artery A. What is its function? Artery A is coronary artery. It supplies oxygen and nutrient to the cardiac muscles.

38. Which blood vessels (W, X, Y and Z) are arteries W and X

39. What is the function of A? Carry oxygen throughout the whole body A B C

40. Which blood vessel (W, X, Y and Z) carries blood from lungs? Y

41. Three types of blood vessels are Artery, vein and capillary

42. Name chamber A. Right atrium

43. What is Z? Plasma Z

44. What is C? Phagocyte A B C

45. Name valves X. Semilunar valve

46. What is A and B? A is elastic tissue, B is muscle

47. What is the function of C? Cell C engulfs germs that enter the body and digest them by phagocytosis. A B C

48. Name valves Y. Tricuspid valve

49. Name valves Z. Bicuspid valve

50. State two differences between A and B The wall of A is thinner than B. The lumen of A is larger than B.

51. White blood cells Made in Red bone marrow

52. Name blood vessel X. Pulmonary artery

53. Blood pressure in venae cavae is very low. Explain how a continuous blood flow is maintained. Valves in the venae cavae prevent backflow of blood. When the muscles lying next to the veins contract, they press against the veins. The veins are squeezed so blood flows forwards.

54. Name blood vessel Z. Vena cava

55. The large lumen in vein can reduce the resistance of blood blood

56. The red pigment in red blood cell is haemoglobin