Because of this difference, the left ventricle needs to be stronger; and so the muscular layer of the left ventricular wall or its myocardium is three times thicker than the right ventricle's myocardium.

由于这种差异，左心室需要更强壮；因此左心室壁的肌肉，即心肌，比右心室的心肌厚三倍。