1. Circulatory System Notes

2. Functions of the circulatory system… -Carries nutrients, oxygen & other needed materials to cells

3. Functions of the circulatory system… -Carries carbon dioxide & other wastes away from cells

4. Functions of the circulatory system… -Blood helps fight disease & heal wounds.

5. Functions of the circulatory system… -Helps maintain body temperature & homeostasis.

6. The circulatory system is made up of the: Blood vessels Blood & Heart

7. muscular organ that pumps blood throughout the body. Heart…

8. right side pumps blood to lungs & left side pumps blood to body… separated by a thick muscular wall called the septum.

9. Upper two chambers are called the atrium (atria) & receive blood into the heart…

10. …the lower two chambers are ventricles that have thick muscles to pump blood out of the heart.

11. Upper & lower chambers are separated by valves that keep blood from flowing backward.

13. muscle contractions that push blood through the blood vessels. Heartbeat

14. You hear the valves opening & closing… when the heart muscles relax the valves open & the atria fill with blood LUB… then the ventricles contract & the valves close DUB.

15. Throbbing of arteries as heart beats & pumps blood… used to determine heart rate. Pulse

16. force with which the ventricles contract. Blood pressure

17. Arteries  Capillaries  Veins Veins Blood vessels…

18. Muscular blood vessels that carry blood with oxygen away from the heart. Arteries

19. Carries blood from heart to lungs… only artery that does not carry oxygenated blood. Pulmonary artery

20. largest human artery that carries blood from the heart to the body. Aorta

21. smallest blood vessels where substances are exchanged by the process of diffusion Capillaries

22. carry blood with carbon dioxide to the heart from the body. Veins…

23. Carries blood from lungs to heart… only vein that not carries oxygenated blood. Pulmonary vein

24. Superior vena cava is the largest vein in the human body.

25. occurs when the pressure in the blood vessels is too high… above 140/90. Hypertension (high blood pressure)

26. The heart has to work harder.

27. Can cause damage to the heart, arteries and other organs.

28. occur when arteries get clogged and stop the flow of blood to the heart muscles. Heart attacks

29. occurs when the blood supply to the brain is cut off or when a blood vessel burst causing damage to brain cells. Strokes

30. is a condition where artery walls thicken and restrict the flow of blood in the arteries. Atherosclerosis

31. Caused by high cholesterol that deposits in the arteries causing them to narrow or harden.

32. Can lead to heart, disease or strokes.

33. occur when the heart rhythm is too fast or too slow. Irregular heartbeats