<P> Pulmonary stretch receptors are mechanoreceptors found in the lungs . </P> <P> When the lung expands, the receptors initiate the Hering - Breuer reflex, which reduces the respiratory rate . Increased firing from the stretch receptors also increases production of pulmonary surfactant . Intercostal muscles and diaphragm receive impulses from the respiratory center, stretch receptors in the lungs send impulses to the respiratory center giving information about the state of the lungs . </P>

When stretch receptors are firing in the bronchi and bronchioles of the lungs you would expect