[Morphofunctional characteristics of the neural structures of the heart during adaptation to physical exertion under experimental conditions]. / Morfofunktsional'nye osobennosti nervnykh struktur serdtsa v usloviiakh adaptatsii kfizicheskim nagruzkam v éksperimente.

The elements of the intramural apparatus in the heart, aorta and pulmonary trunk in 1- and 3-month-old puppies are structurally formed, however, the simplest forms of their organization predominate, especially in the terminal apparatus. A low, mediatory activity of all components in the intramural neural apparatus in the heart, aorta, pulmonary trunk demonstrates their functional immaturity. Under conditions of doses physical loadings, the intracardial neural apparatus reaches its structural and functional maturation more quickly. At training, some components of the cardiac intramural neural apparatus form certain structures peculiar for the state of stimulation. Most often these changes are localized in the preterminals and they should be considered as structural demonstration of the compensatory-adaptive reactions occurring in the organ.

["Tracking" the magnitude of arterial pressure in the circulatory system]. / "Slezhenie" za velichinoi arterial'nogo davleniia v sisteme krovoobrashcheniia

Steady--state characteristics of arterial and venous pressure, cardiac output, total peripheral resistance, heart rate, and pumping heart capacity depending on blood volume change were studied in dogs under conditons of rest, exercises, light and deep narcosis. The tracking mean arterial pressure was found to be the main principle of hemodynamic regulation. In unanesthetized animals the tracking is based on heart regulation component mainly, while under light narcosis it is the vascular component. In deep narcosis it is the suppressed tracking principle: arterial pressure change is proportional to blood volume changes.