[Efficacy of regulation of the vascular tone of the lungs].

Vasomotor responses to activation of sympathetic and parasympathetic lung nerves were studied in the minor circulation, as well as the effect of some vasoactive substances upon vessels and changes in the alveolar air composition. The efficacy of neurohumoral and physical stimuli influence upon the lung resistance function seems to be more obvious at the local level rather than at organic one. This is reflected in actualization of the lung vasomotor control mainly through regional redistribution of the lung blood flow at minimal shifts of the integral vascular resistance. Active changes of the tone of the minor circulation vessels may participate in formation of the lung blood volume shifts in transitory states of the circulation system. Physiological significance of changes in the resistance and capacitance functions of the lung vessels, is discussed.