Sora (Kingdom Hearts) and Donald Duck went on an adventure.
In cardiac physiology , preload is the end diastolic volume that stretches the right or left ventricle of the heart to its greatest dimensions under variable physiologic demand .. cardiac. cardiology. physiology. physiology. ventricle. Ventricle ( heart ). heart. heart. In other words , it is the initial stretching of the cardiomyocytes prior to contraction ; therefore , it is related to the sarcomere length at the end of diastole .. cardiomyocytes. cardiomyocytes. sarcomere. sarcomere. Parameters such as ventricular end diastolic volume or pressure are used to measure preload since the ideal length of the cardiac sarcomere can not be measured .. cardiac. cardiology. sarcomere. sarcomere. Passive filling of the -LRB- heart -RRB- ventricle and subsequent atrial contraction thus allows an echocardiographically volumetric measurement .. ventricle. Ventricle ( heart ). heart. heart. Preload is theoretically most accurately described as the initial stretching of a single cardiomyocyte prior to contraction .. cardiomyocyte. cardiomyocyte. This can not be measured in vivo and therefore other measurements are used as estimates .. in vivo. in vivo. Estimation may be inaccurate , for example in a chronically dilated ventricle new sarcomeres may have formed in the heart muscle allowing the relaxed ventricle to appear enlarged .. ventricle. Ventricle ( heart ). heart. heart. The term end-diastolic volume is better suited to the clinic , although not exactly equivalent to the strict definition of preload .. end-diastolic volume. end-diastolic volume. Atrial pressure is a surrogate for preload .