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.
Cardiomyopathy is a disorder of the heart muscle. Dilated cardiomyopathy - where the heart enlarges (dilates). Hypertrophic cardiomyopathy (HCM) - where the heart muscle becomes thickened (hypertrophied). Restrictive cardiomyopathy - where the heart muscle cannot relax properly between heartbeats.