Three groups of drugs are used to reduce the stickiness of platelets, the tiny blood elements that form the nucleus of a blood clot. By inhibiting the ability of platelets to clump together, the anti-platelet drugs inhibit blood clotting. These drugs are most effective in preventing abnormal blood clots from forming in arteries and are much less effective at preventing thrombosis in the veins. Aspirin and dipyridamole (Aggrenox). These drugs have a modest effect on platelet stickiness but cause fewer bleeding-related adverse effects than the other anti-platelet drugs.
The middle layer of an artery and vein contains mostly. connective tissue. simple squamous epithelium. smooth muscle. nervous tissue. 2. Arteries carry blood. away from the heart. toward the heart. both away and toward the heart.he middle layer of an artery and vein contains mostly. connective tissue. simple squamous epithelium. smooth muscle. nervous tissue. 2. Arteries carry blood. away from the heart. toward the heart. both away and toward the heart.
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.  A middle layer (tunica media) of circularly arranged smooth muscle and elastic fibers.