Blood is continuously moving inside our body.
This movement is called blood circulation: it's the process by which blood flows to distribute oxygen and nutrients to different parts of the body and carries away waste substances.
The circulatory system is formed by:
- Blood: a red liquid which transports substances throughout the body.
- Blood vessels: arteries, veins and capillaries.
- The heart: an organ made up of muscles that are working all the time. The heart is connected to the blood vessels and pumps blood through them to all parts of the body.
 |
| CIRCULATORY SYSTEM. FROM WIKIPEDIA |
No comments:
Post a Comment