Pathway of Blood Through the Heart Functional differences of the two ventricles are revealed in their anatomy The walls of the left ventricle are three-four times as thick as those of the right ventricle, and its cavity is nearly circular The right ventricular cavity is flattened into a crescent shape that partially encloses the left ventricle, much the way a hand might loosely grasp a clenched fist Consequently, the left ventricle can generate much more pressure than the right and is a far more powerful pump