Receptors in the Canine Lung Which Respond to Vascular Pressure Changes

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Abstract
Intrapulmonary neural receptors responding to pulmonary vascular pressure changes were studied. Intrapulmonary receptors which could not be classified as irritant, Hering-Breuer, or Type J [juxtapulmonary capillary receptors] were identified electrophysiologically. These receptors increased impulse frequency in a linear fashion with elevations of pulmonary vascular pressure. Receptors which responded to elevation of pulmonary arterial pressure and receptors responding to elevation of pulmonary venous pressure were identified. Several Hering-Breuer stretch receptors which responded in a linear fashion to elevated pulmonary venous pressure were found. Elevation of pulmonary pressure can increase nerve impulse frequency from Hering-Breuer stretch receptors and baroreceptors located in the intrapulmonary vasculature. Stimulation of these receptors may play a role in the reflex alterations of respiration during cardiac failure.

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