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(D) The $Hering-Breuer$ reflex is a protective mechanism to prevent over-inflation of the lungs. $1$. During inspiration,when the lungs expand to a cr

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Deflated lungs do not stimulate the stretch receptors,so that the inspiratory centre is excited for a new respiratory cycle.

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(D) The $Hering-Breuer$ reflex is a protective mechanism to prevent over-inflation of the lungs. $1$. During inspiration,when the lungs expand to a critical point,the stretch receptors in the walls of the bronchi and bronchioles are stimulated. $2$. These receptors send inhibitory impulses via the vagus nerve to the inspiratory centre in the medulla oblongata. $3$. This inhibits the inspiratory centre,thereby stopping further inspiration and allowing expiration to occur. $4$. When the lungs deflate,the stretch receptors are no longer stimulated,the inhibition is removed,and the inspiratory centre is excited again to begin a new respiratory cycle. Therefore,option $D$ is the correct statement.

Select the correct option with respect to the $Hering-Breuer$ reflex.

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