1. The Circulatory System

2. Why do we need it?
Transportation system by which oxygen and nutrients reach the body's cells, and waste materials are carried away. Also carries substances called hormones, which control body processes, and antibodies to fight invading germs.

3. www.biosbcc.net/doohan/ sample/htm/heart.htm

4. Parts of the Circulatory System
Divided into 3 major parts:
1. Heart
2. Blood
3. Blood Vessels

5. 1. The Heart It is a muscular pump Size of your fist
Thick muscular walls
Divided into 4 chambers (compartments)

6. Chambers of the Heart
Upper chambers – right and left atria receives blood coming IN from the veins (singular: atrium)
Lower chambers – right and left ventricles push blood OUT into the arteries

7. VALVES Flaps that open and close as blood moves through chambers
Prevent backflow
Heart “sounds” are made by the valves as they open and close

8. 2. Blood Pumped by your heart
Carries nutrients, water, oxygen and waste products around body.
Made up of liquids, solids and small amounts of O2 and CO2 gases.

9. 4 Parts of Blood
Red blood cells
White blood cells
Platelets
Plasma

10. Red Blood Cells Carry O2 from the lungs to all the cells of the body
Take CO2 waste from cells back to lungs
About 5,000,000 RBC’s
in 1 drop of blood!

11. White Blood Cells Defend against germs
Actively attack and destroy germs
Have “memory” to
recognize germs

12. Platelets
Stop bleeding when vessels or skin is broken

13. Plasma Liquid part of the blood
Carries the blood cells throughout the body
Plasma is made in the liver.

14. Hollow tubes that bloods travels through
3.Blood Vessels
Hollow tubes that bloods travels through
3 Kinds of Blood Vessels
Arteries
Capillaries
Veins

16. Arteries Carry blood AWAY from the heart Main artery called the aorta
Aorta divides and branches into many smaller arteries

17. Carry oxygenated blood! Shown in RED
Arteries
Carry oxygenated blood!
Shown in RED

18. Capillaries Very thin tubes RBC’s must go through “single file!”
Connect arteries to veins
EXCHANGE HAPPENS HERE!
Food and O2 released to the body cells
CO2 and waste products returned to the bloodstream

21. After blood leaves the capillaries, it is now deoxygenated
and full of waste products.

22. Veins
Receives blood from the capillaries
Carry blood to the heart

23. Veins
Carry deoxygenated blood!
Shown in BLUE

24. Why is it called the CIRCULATORY system?
The heart, the blood vessels, and LUNGS make 1 huge circle that blood constantly travels through.

26. Circulation Heart is a double pump
blood from the right side is deoxygenated and going to the LUNGS (to get oxygen)
blood from the left side is oxygenated and going to the body cells

27. Label & COLOR your diagram (must use red & blue!)
LUNGS
LEFT SIDE
RIGHT SIDE
BODY CELLS