What is the primary function of the Hering-Bruer inflation reflex?

What is the primary function of the Hering-Bruer inflation reflex?

• A. To stimulate coughing when the lungs are overexpanded
• B. To prevent overinflation of the lungs
• C. To increase heart rate during deep breathing
• D. To enhance gas exchange efficiency

Answer: (B)

The primary function of the Hering-Breuer inflation reflex is to prevent overinflation of the lungs. This reflex is a protective mechanism that is activated by the stretch receptors located in the walls of the bronchi and bronchioles. When these receptors detect excessive lung expansion, they send signals via the vagus nerve to inhibit the inspiratory centers in the brain. This inhibition helps initiate exhalation and prevents further inhalation, thereby avoiding damage that could be caused by overinflated lungs. This reflex plays an essential role in regulating the depth of breathing, particularly during deep breaths, thereby maintaining optimal lung function and ensuring that the alveoli are not excessively stretched. It acts as a safety valve, providing a crucial feedback mechanism essential for normal respiratory physiology.

The primary function of the Hering-Breuer inflation reflex is to prevent overinflation of the lungs. This reflex is a protective mechanism that is activated by the stretch receptors located in the walls of the bronchi and bronchioles. When these receptors detect excessive lung expansion, they send signals via the vagus nerve to inhibit the inspiratory centers in the brain. This inhibition helps initiate exhalation and prevents further inhalation, thereby avoiding damage that could be caused by overinflated lungs.

This reflex plays an essential role in regulating the depth of breathing, particularly during deep breaths, thereby maintaining optimal lung function and ensuring that the alveoli are not excessively stretched. It acts as a safety valve, providing a crucial feedback mechanism essential for normal respiratory physiology.