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 For small jobs removing unreinforced concrete (no rebar) you can often hire a local day laborer or handyman to manually break up and haul away the concrete for $100-$400 for a small area such as a patio or $500-$900 for a 500-600 square foot (unreinforced) driveway. Concrete foundation removal can run $600-$4,000 or more for a simple slab, and $1,500-$5,000 or more for a typical home basement.