Identify the effects on the following respiratory neurons following activation of PSRs to produce the response in breathing observed

Question

BlackTom AI · Accepted Answer

Pulmonary stretch receptors (PSRs) trigger the Hering–Breuer inflation reflex: increased lung inflation raises PSR firing, which acts via vagal afferents to the nucleus tractus solitarius (NTS) and then to the medullary respiratory network to terminate inspiration and promote expiration.

Relevant knowledge points and concepts:
- PSRs are slowly adapting mechanoreceptors in airway smooth muscle that increase firing during lung inflation.
- Afferent signals travel in the vagus nerve to the NTS, which modulates the ventral and dorsal respiratory groups.
- Key respiratory neuron types: Inspiratory (I) neurons drive inspiratory muscle activity; Post-inspiratory (Post-I) neurons are active at the start of expiration and help terminate inspiration; Expiratory (E) neurons are active during active expiration.
- The Hering–Breuer inflation reflex prevents overinflation by shortening or terminating inspiration.

Step-by-step reasoning:
1. Lung inflation → PSRs increase firing rate.
2. PSR afferents (vagal) synapse in NTS → interneuronal pathways to medullary respiratory centers.
3. NTS outputs both inhibit inspiratory drive and recruit neurons that end inspiration. Specifically, this pathway suppresses I neurons (reducing inspiratory muscle drive).
4. Simultaneously, PSR input excites Post-I neurons (these fire at the onset of expiration and actively terminate the inspiratory ramp), promoting expiration.
5. The net effect is an earlier termination of inspiration and a shift to expiration (reduced inspiratory duration and, if sustained, slowed respiratory rate).

Why the correct answers are correct:
- "Inhibit Inspiratory neurons": PSR activation reduces inspiratory drive via inhibitory connections from NTS to inspiratory networks, producing termination of inspiration.
- "Excite Post-inspiratory neurons": Activation of Post-I neurons at the transition to expiration is the mechanism that actively ends inspiration; PSR input facilitates these neurons.

Why other choices would be incorrect:
- Exciting inspiratory neurons or inhibiting post-inspiratory neurons would prolong inspiration or delay expiration, which is opposite to the Hering–Breuer inflation response. Exciting expiratory neurons alone is less specific; the critical mediators are inhibition of I neurons and excitation of Post-I neurons.

Conclusion: Activation of PSRs inhibits inspiratory neurons and excites post-inspiratory neurons, matching the provided answers.

Identify the effects on the following respiratory neurons following activation of PSRs to produce the response in breathing observed多项选择题

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