CIRCULATORY SYSTEM
The circulatory system is responsible for the circulation of blood, which is the movement of blood through the body.

BLOOD VESSELS
They are tubes which transport blood through the circulatory system:

The complete circulatory system in a human organisim is very complex, here there are the name of the main vessels:

 

THE HEART

The heart is an organ that works like a pump, and moves blood through the body. It never stops beating.

 



 

This is the beating of a heart:

 

 

BLOOD CIRCULATION
The circulation of blood through the circulatory system carries nutrients and oxygen to all parts of the body, and collects waste substances, which can be dangerous.
There are two circulatory systems:

• pulmonary circulation
• systemic circulation