An increase in either of these physiological components (cardiac output or TPR) causes a rise in the mean arterial pressure. Vasodilation works to decrease TPR and blood pressure through relaxation of smooth muscle cells in the tunica media layer of large arteries and smaller arterioles.
Contractors' prices for 2-4 hours with heavy equipment removing a small area of concrete (such as a 8x10-foot patio 4-8 inches thick) start around $250-$550 and go up. Removing an average driveway is $1,000-$2,500 and up, particularly if it's reinforced concrete. Prices vary considerably by region.
Resurfacing an average 500-square-foot concrete driveway typically costs $2,000-$5,000. For do-it-yourselfers, resurfacing products in buckets or bags can be purchased at home improvement or hardware stories. Total DIY costs can be $2-$5 or more a square foot, depending on the materials used.