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.
It can cause heartburn and diarrhea in people who are sensitive to caffeine, both of which can trigger Crohnâs to act up. Water, low-acid 100% fruit juice, caffeine-free coffee and tea, and skim milk are the best things you can drink if you have Crohnâs. Eat a Low Fiber Diet Most people should eat a high fiber diet to promote regularity and keep the digestive system running smoothly.