1. The Circulatory System

2. Function It’s main function is Transportation
Blood is used as a transport vehicle
transports oxygen, nutrients, cell waste (such as Carbon dioxide), hormones and antibodies vital to maintaining homeostasis to and from cells

3. Parts of the Circulatory System
Divided into three major parts:
The Heart
The Blood Vessels
The Blood

4. The Major Organ-The Heart
Heart acts as pump
The heart pumps beats per minute (at rest)
At REST, the heart pumps about 5 litres of blood a minute.
During EXTREME exercise it can pump 40 litres a minute.

5. Structure Size of your fist Large organ composed of
cardiac muscle--called myocardium
4 hollow chambers
Contain valves to keep blood flowing in ONE direction

6. The pathway looks like a circle
The heart, the lungs, and the blood vessels work together to form the circle part of the circulatory system.

7. The Chambers The heart has 4 hollow chambers
Upper chambers – atrium receives blood coming in from the veins
Left & right Atrium
Lower chambers - ventricle squeezes blood out into the arteries
Left & right ventricle

10. Hollow tubes that circulate your blood
Blood Vessels
Hollow tubes that circulate your blood
Arteries
Veins
Capillaries

11. Arteries Carry blood AWAY from the heart Heart pumps blood
Main artery called the aorta
Aorta divides and branches
Many smaller arteries
Each region of your body has system of arteries supplying it with fresh, oxygen-rich blood.

12. Capillaries Very thin Only one cell thick Connect arteries & veins
Food and oxygen released to the body cells
Carbon dioxide and other waste products returned to the bloodstream

13. Veins Carry blood to the heart Receive blood from the capillaries
Transport waste-rich/ oxygen-poor blood back to the lungs and heart
Valves are located inside the veins
Allow blood to move in one direction

14. Blood
Carries nutrients, water, oxygen and waste products to and from your body cells.

15. Blood – RBCs
Red blood cells carry oxygen from the lungs to all the cells of the body.
Takes carbon dioxide and transports it back to the lungs
About 5,000,000 Red Blood Cells in ONE drop of blood.

17. Blood – WBCs White blood cells protect the body from germs
Attack and destroy germs when they enter the body

18. scienceu.fsu.edu
illus/167i2.htm

19. Blood – Platelets and Plasma
Platelets are blood cells that help stop bleeding
Plasma is the liquid part of the blood
About half of your blood is made of plasma
The plasma carries the blood cells throughout the body
Plasma is made in the liver.