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The function of tunica externa is to ________.

User Carmoreno
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to protect and/or reinforce the blood vessels  
User Bryce Howitson
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The tunica externa (New Latin "outer coat"), also known as the tunica adventitia (New Latin "additional coat")(or adventitia for short), is the outermost tunica (layer) of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and, in arteries, is supported by external elastic lamina.
User John Mangual
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