Atlantic salmon no longer exist in viable numbers in the Atlantic ocean, yet you can still find them in large numbers in the grocery store. Find out why.

1.  It's the most-farmed (raised in captivity) marine fish

2.  Inevitably some have escaped from farming, and their descendants can now be caught in places other than the Atlantic.

Explanation:

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;