Abstract
Nervous regulation of pulmonary vascular tone remains a su~ ~or discussion [7, 8]. Research into the elastic properties of these vessels has been una q. These properties are closely connected with the concept of vascular tone and they are ged by stimulation of autonomic nerves, although in the investigations cited mainly the eflects of the sympathetic innervation were examined [9, i0], and as a rule no attention was paid to regional differences in the pulmonary circulation. The present writers showed previously [2, 4] that distinct regional differences in the character of the response to stimulation of parasympathetic and sympathetic nerves are observed within the same lobe of the lungs.
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