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.
The veins of the upper extremity are divided into two sets, superficial and deep; the two sets anastomose frequently with each other. The superficial veins are placed immediately beneath the integument between the two layers of superficial fascia. The deep veins accompany the arteries, and constitute the venae venÃ¦ comitantes of those. Vessels both sets are provided with, valves which are more numerous in the deep than in the superficial. veins