1. Science 8: Cells & Systems
Circulatory System-The Heart

2. Circulatory System: Delivers nutrients to every cell in our body
Transports oxygen to cells
Removes waste from cells

3. Our heart is an important part of our circulatory system!
It has:
2 sides
2 pumps (one on each side)

4. Sides of the Heart The Right Side:
Pumps blood to the lungs to get fresh oxygen (and get rid of carbon dioxide)
The Left Side:
Receives oxygen-rich blood from the lungs
Pumps oxygen-rich blood to your whole body

5. Top and Bottom Top 2 chambers: Atria Where blood enters the heart
Bottom 2 chambers:
Ventricles
Where blood exits the heart

6. The Aorta:
Largest artery in the body
Sends blood to our whole body
Remember ***
Arteries carry blood away from your heart

7. Vena Cava:
Large veins that carry blood to the heart
Remember***
Veins carry blood to our heart

8. There are 2 Vena Cava:
Superior Vena Cava
Returns deoxygenated blood from the upper half of the body to the right atrium
Inferior Vena Cava
Returns deoxygenated blood from the lower and middle body to the right atrium

9. Valves:
Blood flows from the right atrium to the right ventricle through the tricuspid valve.
Blood flows from the left atrium to the left ventricle through the mitral valve.

10. Deoxygenated blood The valves keep our blood flowing in one direction
Lungs Left atrium
Left Atrium Left ventricle
Left ventricle Body
Body Right atrium
Right atrium Right ventricle
Right ventricle Lungs
Oxygenated blood
Deoxygenated blood

11. Summary for Blood Vessels:

12. Red Blood Cells + White Blood Cells + Platelets = 45 % of our blood
Plasma, the liquid portion of our blood = the other 55%
with Hemoglobin:
Contains iron (Fe)
Transport oxygen
flexible
White blood cell
Fight infection
Platelets
Stop bleeding
Help form clots
Carries nutrients to cells
Carries waste away from cells