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The tunica adventitia is the strong outer covering of arteries and veins. It is composed of connective tissues well as collagen and elastic fibers. The fibers allow the artery to stretch in accordance to the blood flow yet preventing the over-expansion which might result in a busted artery.
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library.thinkquest.org/C0115080/?c=vessels
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Veins and Arteries ... Why don't veins have to be as strong as arteries? ... What connects arteries and veins?
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www.uen.org/utahlink/activities/view_activity.cgi?activ...
www.uen.org/utahlink/activities/view_activity.cgi?activity_id=3043
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Cardiovascular Health question: Why are arteries and veins have a difference of thickness? arteries need to withstand the pressure of the blood being pumped away from the heart. the heart needs a lot ... Are veins thick? Do veins have thick wall? Are veins as thick as arteries? What is the wall thickness of veins?
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wiki.answers.com/Q/Why_are_arteries_and_veins_have_a_di...
wiki.answers.com/Q/Why_are_arteries_and_veins_have_a_difference_of_thickness
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The blood returning from the body is at a much lower pressure than that fired out by the beating heart. So veins do not need to be as strong as arteries.
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www.s-cool.co.uk/gcse/biology/heart-and-circulation/blo...
www.s-cool.co.uk/gcse/biology/heart-and-circulation/blood-vessels.html
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Veins are similar to arteries but, because they transport blood at a lower pressure, they are not as strong as arteries. Like arteries, veins have three layers: an outer layer of tissue, muscle in the middle, and a smooth inner layer of epithelial cells. ... This is accomplished by valves that are located inside the veins.
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www.becomehealthynow.com/article2/bodycardiobloodvessel...
www.becomehealthynow.com/article2/bodycardiobloodvessels/697/
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Veins do not have to be strong like arteries because blood flows through veins to the heart very slowly. In a normal body, the fast-moving, high-pressure blood in the arteries always slows down before it gets to the veins.
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www.strokecenter.org/peds/hemorrhagic.html
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Themes > Science > Life Sciences > General Biology > Physiology > Human Body > Circulatory System > Veins and Arteries ... They don't need to be as strong as the arteries because as blood is returned to the heart, it is under less pressure.
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www.cartage.org.lb/en/themes/Sciences/LifeScience/Gener...
www.cartage.org.lb/en/themes/Sciences/LifeScience/GeneralBiology/Physiology/Humanbody/Circulatorysystem/VeinsandArteries/VeinsandArteries.htm
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Veins carry blood back to your heart. Since this blood is under less pressure, veins are not as strong as arteries: they have the same layers, but each one is thinner. Veins are closer to your skin's surface and easy to reach with needles*, though, which makes them more useful for hemodialysis.
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www.homedialysis.org/resources/tom/200603/
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