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You may have been told that you had a heart attack or a stroke because of a blocked artery. What exactly is an artery? Arteries, like veins, are tube-shaped vessels that carry blood in the body. The chief difference between arteries and veins is the job that they do.
Blood vessels include arteries, capillaries, and veins which are responsible for transporting blood throughout the body.
The blood from the heart is carried through the body by a complex network of blood vessels. Arteries take blood away from the heart. The main artery is the aorta that branches into other major arteries, which take blood to different limbs and organs. These major arteries include the carotid artery, which takes blood to the brain; the brachial arteries, which take blood to the arms; and the thoracic artery, which takes blood to the thorax and then into the hepatic, renal, and gastric arteries for the liver, kidneys, and stomach, respectively.
The iliac artery takes blood to the lower limbs. The major arteries diverge into minor arteries, and then into smaller vessels called arterioles, to reach more deeply into the muscles and organs of the body. Arterioles diverge into capillary beds. Capillary beds contain a large number 10 to of capillaries that branch among the cells and tissues of the body. Capillaries are narrow-diameter tubes that can fit red blood cells in single-file lines and are the sites for the exchange of nutrients, waste, and oxygen with tissues at the cellular level.
Fluid also crosses into the interstitial space from the capillaries. The capillaries converge again into venules that connect to minor veins, which connect to major veins that take blood high in carbon dioxide back to the heart. The major veins drain blood from the same organs and limbs that the major arteries supply.
Fluid is also brought back to the heart via the lymphatic system. The structure of the different types of blood vessels reflects their function or layers. There are three distinct layers, or tunics, that form the walls of blood vessels. The inner, tunica intima is a smooth, inner lining of endothelial cells that are in contact with the red blood cells.
This tunic is continuous with the endocardium of the heart. Unlike veins and arteries, capillaries have only one tunic; this single layer of cells is the location of diffusion of oxygen and carbon dioxide between the endothelial cells and red blood cells, as well as the exchange site via endocytosis and exocytosis.
The movement of materials at the site of capillaries is regulated by vasoconstriction, narrowing of the blood vessels, and vasodilation, widening of the blood vessels; this is important in the overall regulation of blood pressure.
Veins and arteries both have two further tunics that surround the endothelium: the middle, tunica media is composed of smooth muscle, while the outer tunica externa is connective tissue collagen and elastic fibers. The elastic, connective tissue stretches and supports the blood vessels, while the smooth muscle layer helps regulate blood flow by altering vascular resistance through vasoconstriction and vasodilation.
The arteries have thicker smooth muscle and connective tissue than the veins to accommodate the higher pressure and speed of freshly-pumped blood. The veins are thinner walled as the pressure and rate of flow are much lower. In addition, veins are structurally different from arteries in that veins have valves to prevent the backflow of blood. Because veins have to work against gravity to get blood back to the heart, contraction of skeletal muscle assists with the flow of blood back to the heart.
Learning Objectives Explain the structure of arteries, veins, and capillaries and how blood flows through the body. Key Points Arteries carry blood away from the heart; the main artery is the aorta.
Smaller arteries called arterioles diverge into capillary beds, which contain capillaries that branch among the cells and tissues of the body. Capillaries carry blood away from the body and exchange nutrients, waste, and oxygen with tissues at the cellular level. Veins are blood vessels that bring blood back to the heart and drain blood from organs and limbs.
Capillaries have one layer of cells the endothelial tunic or tunica intima where diffusion and exchange of materials takes place. Veins and arteries have two more tunics that surround the endothelium: the middle tunica media is composed of smooth muscle that regulates blood flow, while the outer tunica externa is connective tissue that supports blood vessels. Key Terms vasodilation : dilation of the blood vessels vasoconstriction : constriction of a blood vessel venule : small vein, especially one that connects capillaries to a larger vein.
Arteries, Veins, and Capillaries The blood from the heart is carried through the body by a complex network of blood vessels. This diagram illustrates the major human arteries and veins of the human body. Capillaries consist of a single layer of epithelial cells, the endothelium tunic tunica intima.
Blood vessels include arteries, capillaries, and veins which are responsible for transporting blood throughout the body. The blood from the heart is carried through the body by a complex network of blood vessels. Arteries take blood away from the heart. The main artery is the aorta that branches into other major arteries, which take blood to different limbs and organs. These major arteries include the carotid artery, which takes blood to the brain; the brachial arteries, which take blood to the arms; and the thoracic artery, which takes blood to the thorax and then into the hepatic, renal, and gastric arteries for the liver, kidneys, and stomach, respectively. The iliac artery takes blood to the lower limbs.
Both arteries and veins are types of blood vessels in the cardiovascular system. An artery carries blood away from the heart, and a vein carries blood back to the heart. Blood vessels are essential for transporting blood around the body. The heart and blood vessels make up the cardiovascular system. This system contains a complex network of vessels with various structures and functions. In this article, we discuss the differences between arteries and veins. We also outline different types of blood vessels and how they work as a part of the cardiovascular system.
Blood vessels are flexible tubes that carry blood, associated oxygen, nutrients, water, and hormones throughout the body. Blood vessels are key components of the systemic and pulmonary circulatory systems that distribute blood throughout the body. There are three major types of blood vessels: arteries that carry blood away from the heart, branching into smaller arterioles throughout the body and eventually forming the capillary network. The latter facilitates efficient chemical exchange between tissue and blood. Capillaries in turn merge into venules, then into larger veins responsible for returning the blood to the heart.
Handbook of Biomaterial Properties pp Cite as. Blood and lymphatic vessels are soft tissues with densities which exhibit nonlinear stress-strain relationships . The walls of blood and lymphatic vessels show not only elastic [2, 3] or pseudoelastic  behavior, but also possess distinctive inelastic character [5, 6] as well, including viscosity, creep, stress relaxation and pressure-diameter hysteresis. The mechanical properties of these vessels depend largely on the constituents of their walls, especially the collagen, elastin, and vascular smooth muscle content.
Save my name and email in this browser for the next time I comment. Characteristics Arteries Veins 1. Blood Circulation Arteries carry blood away from the heart to the tissues of the body. Veins carry blood from the tissues of the body back to the heart. Blood Type Arteries carry oxygenated blood expect pulmonary artery.
Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation. These vessels are channels that distribute blood to the body. These systems of tubes are either:.
Veins and arteries are major players in the circulatory system of all vertebrates. They work together to transport blood throughout the body, helping to oxygenate and remove waste from every cell with each heartbeat. Arteries carry oxygenated blood from the heart, while veins carry oxygen-depleted blood back to the heart.
Однако он не смог удержаться от вопроса: - Сколько же вы хотите за оба экземпляра. - Двадцать миллионов американских долларов. Почти столько же поставил Нуматака. - Двадцать миллионов? - повторил он с притворным ужасом. - Это уму непостижимо.
Мне нужно немедленно ее увидеть. - Но, сеньор, она занята с клиентом. - Это очень важно, - извиняющимся тоном сказал Беккер. Вопрос национальной безопасности. Консьерж покачал головой: - Невозможно.
Вгляделся в полоску на пальце и пристыжено покраснел. - О Боже, - хмыкнул он, - значит, эта история подтверждается. Беккеру даже сделалось дурно. - Прошу прощения. Офицер покачал головой, словно не веря своим глазам.
Сьюзан вдруг поняла, что стала смеяться гораздо чаще, чем раньше. Казалось, не было на свете ничего, что Дэвид не мог бы обратить в шутку. Это было радостное избавление от вечного напряжения, связанного с ее служебным положением в АНБ. В один из прохладных осенних дней они сидели на стадионе, наблюдая за тем, как футбольная команда Рутгерса громит команду Джорджтауне кого университета.
Ты говоришь, что наше дерьмовое правительство исходит из высших интересов людей.
recently begun to emerge that molecular differences exist. between arterial and venous endothelial cells even before. blood vessels are formed.Feifiwaxbe 29.03.2021 at 09:23
One of the major differences between arteries and veins is that the arteries carry oxygenated blood to all body parts, whereas veins carry the deoxygenated.Jan K. 03.04.2021 at 01:11
Differences between Arteries and Veins. Arteries and veins are two of the body's main type of blood vessels through which blood flow in the body.Jenny R. 03.04.2021 at 17:34
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