The diameter of the muscle cell and its nucleus were calculated from the area actually point-counted. Quantitative data obtained by measurement of 10 ... the atrial cell diameter showed Fig. 1. Pie diagrams showing the fractions of cellular components such as myofibrils (mf, wavy lines i mitochondria (mt, heavily stippled), glycogen (gl. lightly stippled), lipid droplets (lp, solid) and others (t. blank). The lastanbsp;...