1. Name blood vessel X. Pulmonary artery

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

3. Artery carry blood ________ heart away from

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

5. What is X? Blood cells X

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

7. Name blood vessel W. aorta

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

9. Name valves X. Semilunar valve

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

11. Red blood cells Made in Red bone marrow

12. Name chamber C. Left atrium

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

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

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

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

17. Old red blood cell will broken down in Liver

18. The circulatory system includes Blood Blood vessels Heart

19. 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

20. Name blood vessel Z. Vena cava

21. Main substance in plasma is water

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

23. A DNA moleculeconsists of 2 polynucleotide chains. The chains run in opposite directions and twist to form a Double helix

24. Name valves X. Semilunar valve

25. 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.

26. Name chamber D. Left ventricle

27. Name blood vessel Y. Pulmonary vein

28. Name Q. Septum

29. Vein carry blood ________ heart towards

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

31. Name chamber B. Right ventricle

32. What is B? Lymphocyte A B C

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

34. 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.

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

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

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

38. 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.

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

40. The red pigment in red blood cell is haemoglobin

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

42. Blood platelet Made in Red bone marrow

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

44. Name chamber A. Right atrium

45. What is Z? Plasma Z

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

47. What is C? Phagocyte A B C

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

49. Name valves Y. Tricuspid valve

50. Name chamber B. Bicuspid valve

51. White blood cells Made in Red bone marrow

52. 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.

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

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

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

56. 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.