1. The Circulatory System
CRCT Coach Book: pgs

2. Circulatory System Vocabulary
heart red blood cells
atrium 10. white blood cells
ventricle platelets
artery
vein
capillary
plasma

3. The Circulatory System
PURPOSE:
The circulatory system is a transport system that uses blood to carry nutrients and oxygen to the cells of the body.
It also carries waste products such as carbon dioxide away from the cells.
The circulatory system transports chemical messages between cells and different parts of the body.
It also carries cells and substances that fight disease.

4. Organs of the Circulatory System
Heart
Blood Vessels
Blood

5. The Heart The heart is the main organ of the circulatory system.
It is a muscular organ that consists of two pumps working side by side.
When the heart muscles contract, they push the blood forward on its path.
Each pump involves two chambers.

6. The Heart continued…
The upper chamber of each pump is called the atrium (atria – plural).
The lower chamber of each pump is called the ventricle.
The left side of the heart receives oxygen-rich blood from the lungs and pumps it to then rest of the body.
The right side of the receives oxygen-poor blood from the rest of the body and pumps it to the lungs.

8. Blood Vessels
Blood vessels are the tube like structures through which the blood flows. There are three types of blood vessels:
Arteries – carry blood away from the heart
Veins – carry blood toward the heart
Capillaries – are tiny vessels that connect arteries to veins. They exchange substances such as gases and nutrients between the blood and the body cells.

9. Arteries in Red – away from the heart
Veins in Blue – back to the heart

10. Did you know?????
Blood is never blue! Veins look blue because the blood in veins is dark due to low oxygen levels. Arteries look red because the blood is bright red
due to its high
oxygen content.

11. Composition Blood is composed of two main parts: Plasma Blood cells
Plasma is a yellowish liquid that is mostly water.
It contains nutrients, minerals, salts, and gases.
The blood cells are components that float in the plasma.

12. Composition continued…
There are three different types of blood cells:
Red blood cells – carry oxygen to the cells of the body and carry carbon dioxide away.
White blood cells – help the body fight disease. They attack invading microorganisms and make antibodies that fight disease.
Platelets – are fragments of cells that help form blood clots to stop bleeding.

14. Working Together
The circulatory and respiratory systems work together to bring oxygen into the body and deliver it to cells.
They also work together to carry carbon dioxide away from cells and remove it from the body.

15. O2 O2 O2 O2
CO2
CO2
CO2
CO2
CO2
CO2
CO2
CO2

16. O2 O2 O2 O2 O2
CO2 O2
CO2
Body Cells
CO2
CO2
CO2
CO2

17. CO2
CO2
CO2 O2 O2
CO2 O2 O2 O2 O2 O2
CO2 O2
CO2 O2
CO2 O2 O2 O2
CO2 O2
CO2 O2
CO2 O2 O2 O2

18. Blood travels through
the body and ends
up in a capillary!

19. move through capillaries
Red Blood Cells
move through capillaries
one at a time!
Artery
Vein
Body Cells

20. Now the O2 gets
off, and the CO2
gets on!

21. CO2
CO2
CO2 O2 O2 O2 O2 O2 O2
CO2
CO2
CO2

22. The CO2 goes back
to the lungs where
it gets breathed out!