which consists of cholesterol mainly, and calcium, clotting proteins and other substances that can be found in the lining of the arteries. ??? ??? ??? Plexus Network of blood vessels, usually veins ??? ??? ??? Thrombus Clots that forms on the inner blood vessel wall. ??? ??? ??? Vascular system System that consists of an arterial blood supply, a capillary network, and venous drainage. ??? ??? ???