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 the 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.