1. THE CIRCULATORY SYSTEM

2. Testing Previous Knowledge
Find another person, who was born in the same month as you, and pair up.
See if you can answer these questions:
1) Why do scientists say that the heart is made of two pumps?
2) Where are these two pumps sending blood?
3) What is the difference between the blood sent by one pump, and the other?

3. THE BIG PICTURE The Circulatory System is Two Pumps working together.
Where are the two places the heart is pumping to?

4. THE CIRCULATORY SYSTEM
Blood moves constantly from the heart to the lungs, to the heart, to the body, and back again.

5. GAS EXCHANGE