But the most common uses for HGH are not FDA-approved. Some people use the hormone, along with other performance-enhancing drugs such as anabolic steroids in an attempt to build muscle and improve athletic performance. Yet HGH's effect on athletic performance is unknown.
Right ventricle to coronary artery connections (fistulae) in pulmonary atresia with intact ventricular septum: Clinical and histopathological correlations Right ventricle to coronary artery connections (fistulae) in pulmonary atresia with intact...
1 They have thicker walls than the atria, and they create higher blood pressures to pump blood out of the heart into circulation to the body and the lungs.  The right ventricle pumps deoxygenated blood into pulmonary circulation. The left ventricle pumps oxygenated blood into systemic circulation. The left ventricle is thicker because systemic circulation involves a much larger blood volume than pulmonary circulation.