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alina1380 [7]
3 years ago
11

The function of tunica externa is to ________.

Biology
2 answers:
Eduardwww [97]3 years ago
8 0
To protect and/or reinforce the blood vessels  
polet [3.4K]3 years ago
6 0
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.
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