1. Blood Vessels Lloyd Dean NVQ Level 3 Personal Training

2. Re-Test Time! Click here to start Can You LabelThe Heart? 3. A B F C D E G H Click ontheLeft Atrium I J 4. A B F C D E G H Click ontheLeft Ventricle I J 5. A B F C D E G H Click ontheTricuspid Valve I J 6. A B F C D E G H Click onthe Aortic andPulmonaryValves I J 7. A B F C D E G H Click ontheRight Atrium I J 8. A B F C D E G H Click ontheRight Ventricle I J 9. A B F C D E G H Click onthePulmonary Veins I J 10. A B F C D E G H Click onthePulmonaryArtery I J 11. A B F C D E G H Click onthe Aorta I J 12. A B F C D E G H Click ontheVena Cava I J 13. Game Over 14. Aims

By the end of the lesson you should be able to:

Describe the structure of the different blood vessels

Describe the function of each of the different blood vessels

Create a blood vessel comparison table

15. Structure of Blood Vessels 16. Structure of Layers

Tunica Externa / Adventitia

Outer layer

Largely made up of collagen and elastin fibers

Supports blood vessel by being shock absorber

Tunica Media

Middle layer

Mainly smooth muscle with elastic layers and collagen

Used for vasoconstriction and vasodilation

Tunica Intima

Composed of smooth epithelial cells named endothelium

Minimises friction between moving blood

17. 18. Artery / Arterioles

Arteries

Pumps oxygenated blood to the body

Have narrow lumens

Strong as pumping blood at high pressure

Arterioles

Branches into smaller arteries (arterioles) when nearer tissue

More smooth muscle to control blood flow

19. Capillaries

Thinnest blood vessel

Made of single layer endothelial cells

Bring blood as close as possible to all cells

Exchange of oxygen, carbon dioxide, water, salts, between the blood and the surrounding body tissues takes place

Large quantities cover the muscle, ensuring efficient exchange of gases

20. Veins / Venules

Venules

Vessels formed from capillaries

Drains blood from capillaries into veins

Veins

Have same walls as artery but less thinner, elastic and muscular

Pressure and speed of blood is low

Wider Lumen than artery

Have valves that prevent backflow of blood

21. 22. Comparison of Blood Vessels Feature Artery Capillary Vein Tunica Externa X Tunica Media Thick X Thinner Tunica Interna Size of Lumen Small Microscopic Large Valves X X 23. Aims

You should now be able to:

Describe the structure of the different blood vessels

Describe the function of each of the different blood vessels

Create a blood vessel comparison table