1. The Circulatory System

The transport system in the human body is the circulatory system. The circulatory system consists of:

1. The heart
2. The blood vessels (artery, capillary, vein)
3. The blood

The functions of the circulatory system are:

1. to carry oxygen from the lungs to the rest of the body.
2. to carry digested food from the small intestine to all areas in the body which need it.
3. to fight diseases by using white blood cells.
4. to help in the removal of all wastes from the body.

The circulatory system in human is a closed double circulatory system. The blood is confined to the blood vessels and the blood flows through the heart twice on one complete journey around the body.

Double Circulation

Repeated circulation through the heart is necessary to maintain the blood pressure that is required to keep the circulation of blood around the body. 

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Other Resources:
Circulatory system vocabulary - A vocabulary game on circulatory system