1. Blood Vessels

2. Learning Objectives: Compare and understand the difference in the structure and function of Arteries Veins Capillaries

4. thick muscle and elastic fibres Arteries carry blood away from the heart. the elastic fibres allow the artery to stretch under pressure the thick muscle can contract to push the blood along.

8. 1 2 3

9. Veins carry blood towards the heart thin muscle and elastic fibres veins have valves which act to stop the blood from going in the wrong direction. body muscles surround the veins so that when they contract to move the body, they also squeeze the veins and push the blood along the vessel.

15. Varicose Veins Some blood flows backwards The walls overstretch

16. Artery & Vein Compared

20. Capillaries link Arteries with Veins the wall of a capillary is only one cell thick they exchange materials between the blood and other body cells. The exchange of materials between the blood and the body can only occur through capillaries.

21. arteryvein capillaries body cell A collection of capillaries is known as a capillary bed

27. SUMMARY copy and complete the following; Arteries take blood ______ from the heart. The walls of an artery are made up of thick _________ walls and elastic fibres. Veins carry blood ________ the heart and also have valves. The _________ link arteries and veins, and have a one cell thick wall. Blood is made up of four main things ______, the liquid part of the blood; Red Blood Cells to carry ______; White Blood cells to protect the body from disease and _________ to help blood clot. away platelets towards capillaries plasma oxygen muscular

28. Task Draw and complete a table to compare structure and function of arteries, veins and capillaries. ArteryVeinsCapillary Function Wall Lumen Pressure Valves

29. Task Draw and complete a table to compare structure and function of arteries, veins and capillaries. ArteryVeinsCapillary Function Transport blood towards the heart Transport blood away from the heart Connect arteries to veins Wall Thick, muscular, elastic Thin One cell thin LumenNarrowWide Size of Red blood cell PressureHighLow ValvesNoYesNo

30. (Heart) Valves Valves make things go in only 1 direction

31. Heart Valves Blood should flow in 1 direction only

32. Mitral Valve Between left atrium and left ventricle Also called Bicuspid valve

33. Tricuspid Valve Between right atrium and right ventricle

34. Semi Lunar Valve Between right atrium and right ventricle In aorta and Pulmonary artery

35. Heart Valve operation

36. Artificial Heart Valve