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.
1 The biggest part of a do-it-yourself removal job will be hauling away and disposing of the debris. 2  In some parts of the country recycling fees for concrete are relatively low, but in other areas dump/disposal costs can be $300-$800 or more for the concrete from a typical two-car driveway. Prices vary, but renting an electric jackhammer can be about $50-$100 a day; a concrete saw about $30-$50 (with possibly $50-$150 more for wear on a diamond-tipped blade); and a small skid-steer with a breaker attachment can be $150-$350 a day.