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Veins are provided with valves (in the tunica intima layer) to prevent the backward flow of blood.į.
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All veins carry deoxygenated blood except the pulmonary vein that carries oxygenated blood from lungs to the heart.Į. The blood in the veins has less pressure than in the arteries.ĭ. Thus, the walls of the veins are thinner than that of the arteries.Ĭ. The walls of veins have fewer smooth muscles and connective tissues compared to arteries. Veins are elastic vessels that bring blood from different body parts to the heart, i.e., they carry blood towards the heart.ī. About \(10\% \) of the total blood volume is in the arterial system at any given time.Ī. The arterioles play an important role in regulating blood flow into the tissue capillaries. Arteries are divided into fine branches, known as arterioles, which are further divided to form finer branches called capillaries. The largest artery is the aorta, which originates from the heart and branches out into smaller arteries.į. As the walls of the arteries are thick and non-collapsible, the pressure inside them is very high.Į. All arteries carry pure or oxygenated blood, with the exception of the pulmonary artery that carries the blood from the heart to the lungs for oxygenation.Ĭ. Arteries are elastic vessels that carry blood from the heart to different parts of the body.ī. Below we have listed the types of blood vessels:Ī. Learn Exam Concepts on Embibe Types of Blood Vesselsīlood vessels can be divided into three types based on their structure and functions.
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It forms the inner layer of arteries and veins. Tunica Intima (Tunica Interna): This layer has inner endothelium of long, thin cells of squamous epithelium resting on a basement membrane along with an outer elastic membrane of yellow elastic tissue.It provides support to the vessel and also changes the diameter of the vessel to regulate blood flow and blood pressure. Tunica Media: This layer consists of circular smooth muscles and elastic fibres, and is thicker in arteries than in veins.These fibres allow the arteries and veins to stretch to prevent overexpansion due to the pressure that is exerted on the walls by blood flow. Tunica Adventitia (Tunica Externa): They form strong outer covering of arteries and veins composed of loose connective tissues with longitudinally arranged white and yellow fibres.The walls of the blood vessels (except capillaries) are made up of three layers from outside to inside, surrounding the central blood carrying canal called a lumen. The study of blood vessels is called angiology. They transport blood cells, nutrients and oxygen and carry away carbon dioxide and waste materials from the tissues and organs. The blood vessels are an intricate network of hollow tubular structures carrying blood throughout the body.