1. The T wave indicates the ventricular repolarization in which the ventricles relaxes following the depolarization and contractions. It signals the beginning of ventricular relaxations . 2.Skeletal muscles are attached to the bones and it helps in the voluntary movement in the body .Cardiac muscles are involuntary and are found only in the heart Skeletal muscles operates near the peak of its length – tension curve . Cardiac muscles works on the ascending portion of the curve at lengths that are shorter than the length at which maximum tension can be developed. 3. The patient with 12 ml stroke volume has better cardiac function. Stroke volume is the volume of blood pumped out of the left ventricle of the heart during each systolic contraction . Increase in stroke volume leads to efficient pumping out of blood from the ventricles to all the parts of the body .