Introduction
- All organisms need a continuous supply of food, water and oxygen for survival. They need to transport all these to various parts of their body.
- Also, animals need to transport wastes to parts from where they can be removed.
- I human beings’ the organs of the circulatory system are the heart, blood and blood vessels. The heart acts as a pump to push out blood, and the blood vessels (arteries, veins and capillaries) act as pipes through which flows in the whole body.