BLOOD VESSELS FOR YEAR EIGHT AND ABOVE.pptx

For year 8

1. Blood vessels OBJECTIVES Mention the blood vessels Describe the blood vessels Differentiate between the blood vessels. * Create a link of blood vessels showing their role in blood circulation.

2. Blood vessels These are Arteries - ( aorta- artery- arterioles) Veins - (venacava- vein- venules) Capillaries

3. 2. Blood vessels Carries oxygenated blood away from the heart to the tissues. (except the pulmonary artery) Blood flows at high pressure. It has thick muscular walls It has a small lumen to withstand the high pressure of blood. It has no valve except the Aorta and the pulmonary artery. 6. The largest artery is called AORTA Smallest arteries are called ARTERIOLES Artery: Adaptation and function

4. b. Vein – Adaptation and function Carries deoxygenated blood from the tissues to the heart. (except in the pulmonary vein) Blood flows at low pressure. It has Valves to prevent the backflow of blood It has thin wall with large lumen for free flow of blood. It is visible on the skin. It has no pulse. The large vein is called VENACAVA Smaller veins are called VENULES

5. Identify the blood vessels

6. c. Capillary A capillary is formed between an arteriole and a venule It is one cell thick-tiny as a cell. Capillaries facilitate easy exchange of nutrients and oxygen between the tissues and the blood. Very large surface area. Small lumen. Capillaries link arteries and veins. Adaptation and function

7. Connection of blood vessels

8. Comparing the blood vessels

9. 49. Identify the following blood vessels

10. task 1.Mention the three blood vessels 2. In a tabular form, give five differences between artery and vein.

11. Differences between artery and vein Artery Vein 1 Takes blood away from the heart Takes blood to the heart 2 Has thicker muscular wall Has thinner muscular wall 3 Has smaller lumen Has larger lumen 4 Has no valves Has valves 5 Carries blood at high pressure Carries blood at low pressure 6 All arteries carry oxygenated except pulmonary artery All veins carry deoxygenated blood except pulmonary vein

12. Features of the blood vessels

13. HELP ACTIVITY ON BLOOD VESSELS 1.   What is the function of valves? A. To prevent mixing of oxygenated and deoxygenated blood B. To transport blood in one direction C. To prevent backflow of blood

14. 2.What is the function of veins? A. Transport deoxygenated blood B. Transport oxygenated blood C. Site for exchange of materials

15. 3.What is the function of capillaries? Transports deoxygenated blood B. Transport oxygenated blood C. Site for exchange of materials

16. 4. Which blood vessel transports oxygenated blood to the rest of the body? A. Pulmonary artery B. Aorta C. Hepatic artery D. Renal artery

17. 5.   What are present in veins but absent in arteries? smooth elastic tissues B. muscular tissues C. valves

18. 6 . What is the function of arteries? A. Transport deoxygenated blood B. Transport oxygenated blood C. Site for exchange of materials

19. 7. How are capillaries adapted for their function? Have partially permeable walls One-cell thick endothelium Presence of valves Large lumen

20. 8. What is the function of coronary artery? A. Transports oxygenated blood from aorta to heart muscles B. Transports oxygenated blood from aorta to liver C. Transports oxygenated blood from aorta to kidneys

21. 9. Which blood vessel transports deoxygenated blood from the rest of the body back to the heart? Pulmonary vein Hepatic vein Renal vein Vena cava