1. What is the circulatory system?
I will know that the circulatory system moves blood through the body.

2. Cells and organs

3. Cells and organs Basic unit of structure and function
Group of same cells working together
Group of different tissues that make one structure
Many structures working as a whole

4. Circulatory System Heart, Blood, and Blood Cells Arteries Capillary
Away from the heart
Capillary
smallest blood vessels
Veins
Into the heart
Valves
Flaps that keep blood moving in the right direction

5. Review Questions What is the job of the circulatory system?
It moves blood through the body.
Which blood vessels carry blood away from the heart?
Arteries
What might happen if the valves in a person’s veins fail to close properly?
Oxygen-poor blood might flow away from the heart.

6. Questions How would you describe an artery’s walls?
They are thick and muscular.
Write the following circulatory system structures in order of thickest walls to thinnest walls; capillaries, veins, arteries.
Arteries
Veins
Capillaries

7. Four Chambers in your heart

8. Parts of the Heart The heart is a pump Has 4 chambers
1) Right Atrium
2) Right Ventricle
3) Left Atrium
4) Left Ventricle
Blood leaves heart through the Aorta
Body’s largest artery

9. Extra Resources http://kidshealth.org/en/kids/heart.html