Vessels of the circulatory system are Arteries, Veins, and Capillaries. Blood vessels are the channels or conduits through which blood is distributed to different parts of the body.
Arteries carry oxygenated blood away from the heart to all other blood tissues. The walls of the artery consist of the three-layer, which includes the innermost layer, which is the tunica intima, the middle layer, which is the tunica media, and the outer layer, which is the tunica externa.
Capillaries’ are the smallest and the most numerous blood vessel; they connect veins and arteries, their thin wall allows nutrients, oxygen, carbon dioxide, and other wastes to pass to and from cells.
The veins carry blood toward the heart; after blood passes through capillaries, they pass through the smallest vein called venules. From the venules, it flows into a larger vein until it reaches the heart.