1. The Circulatory System and the Immune System

3. Key Point #1 The main function of the circulatory system is to pump blood and transport needed materials around the body.

4. Key Point #2 The main organ of the circulatory system is the heart. It pumps the blood so it can circulate to all of our body cells to deliver oxygen and remove carbon dioxide.

5. PRACTICE WITH A PARTNER (7 MIN) Complete the worksheet “An Efficient System” with a partner. You may write on this. This will be graded.

6. Key Point #3 When you do more physical activity, your heart pumps faster to deliver more oxygen and nutrients to the cells to create energy.

7. Remember the Lab? What happened when we exercised?

8. Key Point #4 The circulatory system is also made up of blood vessels (tubes) called arteries, veins and capillaries.

9. Which direction does blood in arteries travel? Which direction does blood in veins travel? What are the smallest blood vessels?

10. Partner Work Read the article “Tubes for Carrying Blood” and “Oxygen and Nutrient Carrier.” Answer the questions This will be graded.

11. THE IMMUNE SYSTEM

12. Immune System Video http://www.brainpop.com/health/bodysyste ms/immunesystem/

13. Immune System Attack! http://kidshealth.org/kid/htbw/_bfs_ISmovies ource.html

14. Key Point #1 The immune system’s function is to produce antibodies to help fight disease-causing organisms.

15. Key Point #2 White blood cells, found in the blood, are the cells that fight the disease causing organisms.

16. These Y shaped things are antibodies. White blood cells make antibodies. KP #3: The immune system attacks and kills pathogens, which are microscopic invaders.

18. Read about HIV, a disease that weakens your immune system. What do you already know about HIV? Answer the questions.