The quad cab has a smaller back seat and a larger bed, the crew cab has a larger back seat and a smaller bed. To compare them you can go to http://www.ramtrucks.com/en/2011/ram_150... and select the Build My Own option from the bottom of the page.
Heart muscle thickening (called cardiac hypertrophy) can be a healthy response to exercise and pregnancy; however, it often occurs in people with high blood pressure, diabetes, heart failure and certain genetic conditions.
Heart muscle. Thickest, largle is the cardiac muscle tissue that pumps blood out of the heart chambers. Muscle fibers are in planes, separated by connective tissues richly supplied with blood capillaries, lymph capillaries, and nerve fibers. Contracts to pump blood from heart chambers.