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.
Eating asparagus before you go out, or while you're drinking, can help prevent or ease a hangover, according to 2009 research from Korea. Scientists found that extracts taken from the leaves and shoots of asparagus boosted levels of important enzymes that break down alcohol after heavy drinking.