How long do inspiratory neurons fire during quiet breathing?

During quiet breathing, inspiratory neurons typically fire for about 2 seconds. This duration is essential for the normal rhythm of respiration, allowing for adequate inhalation of air into the lungs. The firing of these neurons activates the diaphragm and intercostal muscles, facilitating the expansion of the thoracic cavity and the drawing in of air. This process is part of the rhythmic control of breathing managed by the brainstem, particularly the medulla oblongata and pons, which regulates the timing of both inhalation and exhalation.

The 2-second duration ensures that there is enough time for oxygen-rich air to be adequately inhaled before the respiratory cycle transitions into exhalation, which is typically shorter and involves a passive recoil of the lungs. Understanding this firing duration is crucial for grasping how the respiratory system maintains both rest and efficiency during various activities.