Blood Vessels - Blood Vessels...

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Blood Vessels The central opening of a blood vessel,  the lumen, is surrounded by a wall  consisting of three layers: The tunica intima is the inner  layer facing the blood. It is  composed of an innermost layer  of endothelium (simple  squamous epithelium)  surrounded by variable amounts  of connective tissues. The tunica media, the middle  layer, is composed of smooth  muscle with variable amounts of  elastic fibers.
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The tunica adventitia, the  outer layer, is composed of  connective tissue. The cardiovascular system consists of  three kinds of blood vessels that form a  closed system of passageways: Arteries carry blood away from  the heart. The three kinds of  arteries are categorized by size  and function: Elastic arteries  (conducting arteries) are  the largest arteries and  include the aorta and other  nearby branches. The 
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tunica media of elastic  arteries contains a large  amount of elastic  connective tissue, which  enables the artery to  expand as blood enters  the lumen from the  contracting heart. During  relaxation of the heart, the  elastic wall of the artery  recoils to its original  position, forcing blood  forward and smoothing the  jerky discharge of blood  from the heart.
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Muscular arteries  (conducting arteries)  branch from elastic  arteries and distribute  blood to the various body  regions. Abundant smooth  muscle in the thick tunica 
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Blood Vessels - Blood Vessels...

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