Types and functions of the blood vessels in the circulatory system
The blood flows inside the body through a network of 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 arteriesÂ
The arteries are thick blood vessels that 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 the 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 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 food and oxygen to the cells and carry carbon dioxide and wastes.
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