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.
Dehydration: Arguably the easiest culprit in the mix for causing acne would be the fact that alcohol dehydrates your skin. Water is essential for healthy skin. By drinking alcohol you counteract hydration and thus, your body doesnât get cleansed and your cells can be filled with toxins that may cause acne. As it is, many of us normally donât get enough water on a daily basis so having alcohol in your system only makes it worse.