part of ventricular cardiac muscle cell differentiation cardiac muscle cell development ventricular cardiac muscle cell development ventricular heart muscle cell development GO:0055015 biological_process ventricular cardiomyocyte development The process whose specific outcome is the progression of a ventricular cardiac muscle cell over time, from its formation to the mature state. Cardiac muscle cells are striated muscle cells that are responsible for heart contraction. The ventricle is the part of the heart that pumps blood out of the organ.