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Blood vessels (exchange vessels (veins are a large volume , low pressure…
Blood vessels
exchange vessels
capillaries, venous sinusoids, venules
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constitutes the microvascular bed, the structural basis of the microcirculation
veins are a large volume , low pressure system of blood vessels conveying blood back to the heart
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with the exception of capillaries and venules, all blood vessels have walls of 3 concentric layers - the tunica intima, tunica media and tunica adventitia
tunica intimia
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main component, endothelium, lines entire vascular system including the heart and lymphatics
tunica media
consists of muscle tissue, elastic fibres and collagen (in various proportions depending on the vessel)
thickest layer in arteires, thin in veins
tunica adventitia
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consists of connective tissue, nerves and vessel capillaries
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capillaries
continuous
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found in muscle, brain, thymus, bone, lung
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fenestrated
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present in tissues with substantial fluid transport (intestinal villi, choroid plexus, ciliary processes of the eye)
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resistance vessels
arterioles and arteries
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distributing arteries are smaller arteries with a well developed muscular wall supplying individual organs
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