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.
Alcohol burns up B-vitamins, especially vitamin B-1 (thiamin). If you drink, take a B-complex vitamin supplement plus extra thiamin (100 mg) on days you use alcohol. This will help protect your nervous system and potentially avoid the nerve damage seen in alcoholics as the result of thiamin deficiency.