15. Of which substance do
elastic fibers of the connective
tissue are made? What are
some functions of these
fibers?

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The elastic fibers made of a
called elastin.

Elastic abound in artery ,
helping the maintenance the arterial
blood in these vessels.They
also present in lungs, providing
them elasticity (some respiratory
are caused by of
these fibers). many other organs
tissues the elastic are found in
interstitial matrix.