Structure and Function of Arteries, Capillaries, and Veins. The walls of arteries and veins have three layers or tunics: 1  An outer layer (tunica adventitia) of connective tissue with collagen fibers. 2  A middle layer (tunica media) of circularly arranged smooth muscle and elastic fibers.
You might have heard that eating chocolate or greasy foods can cause acne, but these are both just myths. The truth is that food has little to do with breakouts. Acne occurs when the openings of hair follicles become blocked with oil secretions, dead skin cells and bacteria.
-Really oily foods can cause acne.Likee pizza or Mc.Donalds for example.I still eat it eaither way xD. You should go to your docter & they should prescribe something for you.Drink lots of water everyday to clean your body and face. aliciababiie8O8 Â· 6 years ago.