<P> Arteries have a great deal more smooth muscle within their walls than veins, thus their greater wall thickness . This is because they have to carry pumped blood away from the heart to all the organs and tissues that need the oxygenated blood . The endothelial lining of each is similar . </P> <P> Excessive proliferation of vascular smooth muscle cells contributes to the progression of pathological conditions, such as vascular inflammation, plaque formation, atherosclerosis, restenosis, and pulmonary hypertension . </P>

What types of receptors are typically found on blood vessels