Identify the effects on the following respiratory neurons following activation of PSRs to produce the response in breathing observed
确定在激活 PSRs 以产生所观察到的呼吸反应后，以下呼吸神经元受到的影响。

Question

BlackTom AI · Accepted Answer

Pulmonary stretch receptors (PSRs) in the airway/lung wall send vagal afferents to the nucleus tractus solitarius (NTS). Their activation produces the Hering–Breuer inflation reflex: signals from PSRs shorten inspiratory time and suppress further inspiratory drive. This reflex operates by modulating specific medullary respiratory neurons.

1) Relevant knowledge points and concepts
- PSRs are slowly adapting stretch receptors activated by lung inflation; afferents travel via the vagus to the NTS.
- Medullary respiratory neuron classes: pre-inspiratory (pre-I) neurons (generate/drive inspiration) and augmenting expiratory (late E) neurons (active during expiration, especially during active/late expiration).
- The Hering–Breuer inflation reflex terminates inspiration and reduces the need for active expiratory drive.

2) Step-by-step reasoning
- PSR firing increases with lung inflation → vagal afferents excite NTS interneurons.
- NTS interneurons project to and inhibit inspiratory network elements (pre-I neurons in the pre‑Bötzinger/VRG region), causing early termination of inspiration and shortening inspiratory time.
- Inflation reduces the requirement for active (muscle-driven) expiration; PSR-driven pathways therefore suppress neurons mediating active expiration (augmenting, late E neurons), decreasing active expiratory motor drive.

3) Intermediate physiological steps (no numeric calculations)
- PSR activation → increased vagal firing → NTS activation → inhibitory interneuronal output to pre-I neurons → decreased pre-I firing → inspiration ends earlier.
- PSR activation → inhibitory influence on augmenting expiratory neurons → reduced late-E firing → less active expiratory drive.

4) Why these answers are correct
- Inhibiting pre-inspiratory neurons directly explains shortened inspiration and the observed cessation/curtailing of inspiratory activity.
- Inhibiting augmenting expiratory (late E) neurons is consistent with reduced active expiratory motor output during sustained inflation (lung recoil and mechanical factors reduce need for active expiration), so PSR input suppresses these E-aug neurons.

5) Why other responses would be incorrect
- Excitation of inspiratory (pre-I) neurons would prolong inspiration, opposite to the Hering–Breuer inflation reflex.
- Excitation of augmenting expiratory neurons would enhance active expiration, which does not match the typical reflex response to inflation at rest.
- Any answer claiming PSR input solely excites respiratory rhythm generators contradicts the well-established inhibitory effect on inspiratory drive.

Conclusion: PSR activation inhibits both pre-inspiratory neurons and augmenting (late) expiratory neurons — matching the provided correct answers.

Identify the effects on the following respiratory neurons following activation of PSRs to produce the response in breathing observed 确定在激活 PSRs 以产生所观察到的呼吸反应后，以下呼吸神经元受到的影响。Multiple choice

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