[Quantitative assessment of different parts of the heart in young and old white rats].

By means of a complex of macro- microscopical methods 75 hearts of healthy white rats (6-8-month-old and 24-28-month-old) have been studied. In the old animals all the cardiac parts undergo hypertrophy with a predominant size enlargement of the left ventricle. The part of the stromal elements increases, too, as well as diversity of metric characteristics in myocytes, the blood supply deteriorates and this, in its turn, affects unfavourably the compensatory-adaptive potency of the myocardial areas.