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الیاف الاستیک
The middle layer, tunica media, consists of concentric layers of smooth muscle cells, elastic fibers, collagen fibers, and
The tunica media is made of one to five lay- ers of smooth muscle cells and a few elastic fibers.
As the venule size increases, layers of connective tissue and then smooth muscle cells are added. when the size of the venule is approximately 50 m, elastic fibers and smooth muscle fibers can be found between the tunica intima and the tunica adventitia.
The bronchioles are made up of smooth muscle cells and elastic fibers.
Alveolar sacs (clusters of alveoli) and alve- oli branch off of alveolar ducts, which contain smooth muscle cells, elastic fibers, and collagen fibers.
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