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.
Chocolate per se will not make you break out, says Dr. Shamban. In fact, there is little evidence that chocolate or any specific fatty foods will cause acne, but we do know that a high-sugar/high-fat diet can increase sebum production and promote inflammatory responses in the body -- which can lead to acne.o if chocolate can't be directly pinned to breakouts but definitely falls into the high-sugar/high-fat category, are certain types (dark, milk, white) better or worse for you? Milk and white chocolate overall have more dairy, sugar and other additives than dark chocolate, explains Dr. Shamban.