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The types and the functions of the blood vessels in the circulatory system

The blood vessels

The blood flows inside the body through a network of the blood vessels , So , they are the paths of the blood throughout the body , The types of the blood vessels are the arteries , the veins and the blood capillaries .

The blood vessels

The blood vessels

The arteries 

The arteries are thick blood vessels which emerge from the heart exactly from the two ventricles . And they transport the blood from the heart to all the body parts .

The arteries are large and wide at the beginning ( at the heart ) , then they become smaller till end in a network of the blood capillaries near the cells .

All the arteries carry blood rich in oxygen except the pulmonary artery which carries blood rich in carbon dioxide , The Aorta and the pulmonary artery are examples of the arteries .

The veins

The veins are thin blood vessels that begin at the body cells and open in the heart exactly in the two atria , And they carry the blood from all the body parts to the heart at the two atria .

The veins begin in the form of the blood capillaries at the cells , then collect together to become larger till reaching the heart .

All the veins carry the blood rich in carbon dioxide except the pulmonary veins which carry the blood rich in oxygen , The pulmonary veins , the superior and the inferior vena cava are examples of the veins .

The Atria receive the blood from the veins , while the ventricles pump the blood through the arteries  . And the Arteries end with the blood capillaries , while the veins begin with the blood capillaries .

The blood capillaries

The blood capillaries are the network of the tiny blood vessels with very thin walls , And they are located within the tissues and around the cells .

The blood capillaries connect the ends of the arteries and the beginnings of the veins , The thin walls of the blood capillaries allow the blood to deliver the food and oxygen to the cells and carries carbon  dioxide and the wastes .

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