<span>The pressure generated during contraction of the atria is less than that generated during contraction of the ventricles.The reason is the different distance from the artria to ventricles and the distance from ventricles to circulatory system. </span>The distance from atria<span> to </span>ventricles<span> is </span>less than<span> that from </span>ventricles<span> to circulatory system.</span>