The document describes the basic components and function of the human circulation system, including that it has five main parts, the heart pumps blood through arteries, veins, and capillaries to deliver oxygen and remove waste from cells throughout the body, and blood contains red blood cells, white blood cells, platelets, and plasma.

1. Circulation System

2. There are five parts to your circulation system. Can you guess what they are?

3. This picture is a simple version of the circulation system. Can you see the parts of the circulation system yet?

4. This is the heart. What job does it do?

5. The heart pumps the blood around the body.

6. The blood is made of four different parts. The liquid part is called plasma

7. Red blood cells carry oxygen.

8. White blood cells attack microbes.

9. Platelets block cuts.

10. Your blood has to travel around your body. How does it get from one place to another ?

11. There are three different kinds of blood vessel in your body.

12. Arteries Thick walls Stretches easily Very strong

13. Veins Thin walls Contain valves to make the blood flow in one direction

14. Capillary Very narrow One cell thick Next to every cell in your body

15. Facts about the circulation system You have four litres of blood in your body Your heart beats 100,000 times a day Your body contains 100,000km of blood vessels