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Histology of Blood vessels

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´╗┐Histology of Blood Vessels Arteries Arteries are blood vessels that carry blood away from the heart and this blood is normally oxygenated. Pulmonary arteries are the arteries of the pulmonary circulation, which is the portion of the cardiovascular system which carries deoxygenated blood away from the heart to the lungs and returns oxygenated blood back to the heart. The aorta is a main artery as it receives blood of the left ventricle of the heart through the aortic valve. The arterioles are the smallest of the arteries and they help regulate blood pressure by the contraction of the smooth muscle of their walls and their supply to the capillaries. The structure of the aorta and large arteries corresponds well to their function which serves as a blood reservoir and to stretch or recoil with the pumping action of the heart. ...read more.


The arteries have three layers and the smoothness of the inner layer enables blood to flow easily with no obstacles. Capillaries The capillaries are where all of the important exchanges happen in the circulatory system. Capillaries are very thin, fragile blood vessels that receive oxygen-rich blood from arteries, exchange oxygen and carbon dioxide and then deliver the waste-rich blood to the veins. Capillaries are only one epithelial cell thick and blood can only flow through them in a single file. The red blood cells inside the capillary release their oxygen, which passes through the wall and into the surrounding tissue. The tissue releases its waste products, e.g. carbon dioxide, which pass through the wall and into the red blood cells. The exchange occurs and the waste blood is carried back to the heart and lungs through the veins. ...read more.


It is a large blood vessel that carries blood from the lungs to the left atrium of the heart. There are four pulmonary veins which extend from the left atrium to the lungs. They are the right superior, right inferior, left superior and left inferior pulmonary veins. Pulmonary Veins are the large blood vessels that bring blood to the left side of the heart from the lungs. The pulmonary veins are the only veins in the body that transport oxygenated blood. Veins carry waste-rich blood back to the lungs and heart and they carry blood at a lower pressure than the arteries, so they are not as tough as the arteries. They have three layers, which are thinner and contain less tissue than those in the arteries. The veins have valves inside them, which help ensure the blood flows in one direction through the veins and that the blood flows against the force of gravity. ...read more.

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