Circulatory System
You must have noticed that when we get hurt, blood starts to come out.
Do you know where this blood comes from?
It is the heart.
The heart, the arteries, the capillaries, and the veins are together called the circulatory system. The heart is the most important organ in the circulatory system. It is located in the chest, a little to the left. It pumps blood to all parts of the body. The two types of blood vessels connected to the heart are arteries and veins. The blood vessels that carry blood rich in oxygen from the heart to other parts of the body are called arteries. The blood vessels that carry blood rich in carbon dioxide back to the heart from other parts of the body are called veins. Veins carry blood that is rich in carbon dioxide and needs to be purified. This unpurified blood is pumped back to the lungs. There it gives up carbon dioxide and takes in fresh oxygen. Again it returns to the heart, ready to be pumped all around the body. In this way, blood keeps on flowing in our body. To keep your heart healthy, exercise a lot.