what is the difference between spider veins and veins?
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In this Article Varicose veins are large, raised, swollen blood vessels that twist and turn. They usually develop in the legs and can be seen through the skin. Spider veins are smaller, red, purple, and blue vessels that also twist and turn. Spider veins are easily visible through the skin, as well.
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Superficial vein is a vein that is close to the surface of the body. This differs from deep veins that are far from the surface. Superficial veins are not paired with an artery, unlike the deep veins, which typically have an artery with the same name close by.
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Arteries carry blood away from the heart and veins return blood to the heart. Veins are generally larger in diameter, carry more blood volume and have thinner walls in proportion to their lumen. Arteries are smaller, have thicker walls in proportion to their lumen and carry blood under higher pressure than veins.
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Arteries have thick walls composed of three distinct layers (tunica) Veins have thin walls but typically have wider lumen (lumen size may vary depending on specific artery or vein) Capillaries are very small and will not be easily detected under the same magnification as arteries and veins.
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A vein is defined as a vessel that conducts blood from the periphery to the heart. All veins carry deoxygenated blood–except for the pulmonary vein. The largest veins are the superior and inferior vena cava, and both drain directly into the right atrium of the heart.
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Hormonal fluctuations, for example, can play a role. Shifting hormone levels, particularly during pregnancy or while taking birth control pills or other hormonal therapies, increase the risk for developing spider veins. Hormones, such as estrogen and progesterone, may relax or weaken vein walls.
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Varicose Veins Normally, the valves help blood flow to your heart . When they don't work right, blood pools inside your veins. They swell and become large and rope-like. That's another difference from DVT -- the surface-level clots that come with varicose veins don't usually break free and travel to your lungs.
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Artery vs. vein. 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.
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Varicose veins are enlarged, twisted veins. Varicose veins can happen anywhere in the body, but are more common in the legs. Varicose veins are not considered a serious medical condition. But, they can be uncomfortable and can lead to more serious problems.
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Spider veins on the face are often the result of tiny blood vessels bursting. Increased pressure or sun damage can cause this to occur.
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Arteries are thicker due to a higher and more fluctuating blood pressure. Veins are thinner. Peripheral veins have valves to keep blood flowing in one direction toward the heart.
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Veins are generally larger in diameter, carry more blood volume and have thinner walls in proportion to their lumen. Arteries are smaller, have thicker walls in proportion to their lumen and carry blood under higher pressure than veins. Arteries and veins often travel in pairs using the same connective tissue pathways.
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To return blood to the heart, there is a series of venules, veins, and muscular veins. Venules have much larger lumina and thinner walls than corresponding arterioles. Similarly, the veins are distinguishable from arteries and arterioles, because their walls are much thinner, compared to the diameter of their lumen.
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Spider nevi are commonly distributed over the face, necklace area, forearms, hands and the upper part of chest, i.e., mainly over the region drained by the superior vena cava. Vascular spiders have been attributed to excessive levels of estrogen because estrogens cause blood vessels to enlarge and dilate.
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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. ... They're part of two closed systems of tubes that begin and end at the heart.
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Blood is drawn from the veins and not the arteries for a couple of reasons. Firstly, the veins have a much lower pressure than the arteries, and...
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Arteries have a great deal more smooth muscle within their walls than veins, thus their greater wall thickness. This is because they have to carry pumped blood away from the heart to all the organs and tissues that need the oxygenated blood. The endothelial lining of each is similar.