1. How Blood Moves as it Travels Through the Body

2. Where it is Found
Blood is found within the heart of blood vessels
Types of Blood Vessels:
Arteries and arterioles
Veins and venules
Capillaries

3. Structure of Blood Vessels
Three layers:
Outer Layer – Tunica externa
Made of fibrous tissue for protection
Middle Layer – Tunica media
Made of smooth muscle for movement
Inner Layer – Tunica interna
Made of squamous epithelial cells for absorption

4. Arteries and Arterioles
Carry oxygenated blood away from the heart
Contain an extra layer made of elastic tissue called the elastic laminae
Helps deal with the increased blood pressure

5. Veins and Venules Carry deoxygenated blood back towards the heart
Surrounded by skeletal muscle to help push the blood towards the heart
Contains valves to prevent backflow

6. Capillaries
Blood vessels found between arterioles and venules where gas exchange occurs
Only made of tunica interna to allow for easy absorption

7. Blood’s Pathway Around the Body

8. Superior and Inferior Vena Cava

9. Right Atrium

10. Tricuspid Valve

11. Right Ventricle

12. Pulmonary Semilunar Valve

13. Pulmonary Trunk

14. Left and Right Pulmonary Arteries

15. Capillaries within the Alveoli of the Lungs

16. Left and Right Pulmonary Veins

17. Left Atrium

18. Bicuspid Valve

19. Left Ventricle

20. Aortic Semilunar Valve

21. Aorta

22. Arteries

23. Arterioles

24. Capillaries

25. Venules

26. Veins

27. Superior and Inferior Vena Cava