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.
Frank-Starling law of the heart. Volume of the heart increases in response to an increase in the volume of blood filling the heart (the end diastolic volume).The increased volume of blood stretches the ventricular wall, causing cardiac muscle to contract more forcefully (the so-called Frank-Starling mechanisms).trial stretch receptors. An increase in heart rate due to an increase in central venous pressure. Increased blood volume is detected by stretch receptors located in both atria.