Pro-throbogenic; will promote blood clotting if it is damaged: growth factors present within platelets that allows re-grow and repair of the damaged area. It will become large enough to form a blockage (diagram: clots in blood vessels: atherosclerosis; plaque form in the endothelial tissues. condition in which an artery wall thickens as a result of the accumulation of fatty materials such as cholesterol. > eventually leads to high blood pressure: hbp will cause blood clot and will form thrombus and then embous ( flushes the bump off the bv wall, and down to the systemic extermeties) Arteries y y artery have smaller lumen than vein y y very large arteries(aorta and branches) they are referred to elastic artery because it contains lots of elastic. Internal elastic membrane is able to recoil the membrane when it stretches ** fibres. Vein y y post-capillary venule is just an endothelium with some connective tissue.