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 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 .
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 .