2. What is the circulatory system’s job? Carries needed substances to cells Carries waste products away from cells

3. Most substances that need to get from one body part to another are carried by the blood. Oxygen Glucose (sugar)

4. When a cell uses glucose, it produces carbon dioxide as waste. The cardiovascular system carries it to the lungs. Then it is exhaled.

5. The cardiovascular system also carries cells that fight disease. White Blood Cells

6. Heart Lungs Arteries Veins Capillaries What are the main parts of the cardiovascular system?

7. A hollow muscle that pumps blood. Made of cardiac muscle. It does not get tired. It rests only between each beat. Every minute, the heart can pump 5 Liters of blood.

8. Hand out Heart Parts sheet.

9. Backwards heart Human heart has 4 chambers Two upper chambers are called atria (plural) or atrium (singular)

10. Deoxygenated Blood Blood that has very little oxygen in it. This blood has been pumped out to the body and given the oxygen to the cells. BLUE This blood has just come from the lungs, where it picked up oxygen. It is pumped out to the body, full of oxygen. RED Oxygenated Blood

11. Small sacs where gas exchange takes place. Each alveoli is wrapped in capillaries.

12. Right Atrium receives deoxygenated blood. It is low in oxygen and high in carbon dioxide.

13. Superior Vena Cava Brings oxygen low blood from the upper body to the heart. From the head From the arms Brings oxygen low blood from the lower parts of the body to the heart. Legs Internal organs Inferior Vena Cava

14. Receives blood from the lungs. It is high in oxygen and ready to be pumped out to the body.

15. Receives oxygen rich blood from the lungs through the: Anyone know another word for the lungs? Pulmonary Vein

16. Receives blood from the right atrium. Pumps oxygen poor blood to the lungs.

17. Receives blood from the left atrium. Pumps oxygen rich blood to all parts of the body.

18. Thick, muscular wall that separates the two sides of the heart. Prevents oxygen rich blood from mixing with oxygen poor blood.

19. The oxygen low blood leaves the heart to go to the lungs to pick up oxygen. Leaves the heart through the: Pulmonary Artery

20. Leaves the heart through one artery. Largest artery in the body. Aorta

21. Valves allow blood to move through, but do not allow it to move backwards. The heart has four valves.

22. The valve that allows blood into the aorta. Aortic Valve

23. Valve that allows blood into the Pulmonary Artery. Pulmonary Valve

24. Valve that allows blood to travel from the right atrium to the right ventricle. Tricuspid Valve

25. Valve that allows blood to travel from the left atrium to the left ventricle. Mitral Valve