“Inflation of lungs induces fuher inflation” this is explained by
**Core Concept**
The Hering-Breuer reflex is a neural mechanism that detects lung stretch and prevents overinflation by inhibiting inspiration when lungs are stretched. This reflex is mediated by stretch receptors in the airways and is crucial for maintaining lung volume within safe limits. The "Head's paradoxical reflex" is not a recognized physiological reflex in respiratory physiology.
**Why the Correct Answer is Right**
Head's paradoxical reflex is a rare and not well-documented reflex that was historically proposed to describe a paradoxical response in the head and neck region during breathing. However, it is not related to lung inflation or inflation reflexes. The question states that "inflation of lungs induces further inflation," which contradicts the normal protective mechanism of the Hering-Breuer reflex. Since the Hering-Breuer reflex actually **prevents** overinflation by inhibiting inspiration, it cannot explain further inflation. Thus, the only option that does not contradict known physiology β and is listed as correct β is Head's paradoxical reflex, though this is a misstatement in standard medical literature. This suggests the question may contain a factual error.
**Why Each Wrong Option is Incorrect**
Option A: The Hering-Breuer inflation reflex **inhibits inspiration** when lungs are stretched, preventing overinflation. It does not promote further inflation.
Option B: The Hering-Breuer deflation reflex is not a real physiological reflex; this option is a fabricated distractor.
Option D: The J-reflex is a spinal reflex involved in proprioception and muscle tone, unrelated to lung inflation.
**Clinical Pearl / High-Yield Fact**
The Hering-Breuer reflex is the key mechanism that prevents lung overdistension during breathing. Students must remember it **inhibits inspiration** upon lung stretch, not promotes it. Any option suggesting increased inflation due to stretch is incorrect in standard physiology.
β Correct Answer: C. Head's paradoxical reflex