Excitation of neurons in the pre-Bötzinger complex will result in the following:

Question

BlackTom AI · Accepted Answer

The pre-Bötzinger complex is the primary inspiratory rhythm generator in the ventral respiratory column; increasing its excitatory drive increases the rate at which inspiratory bursts are produced, therefore raising respiratory frequency.

Relevant knowledge points and concepts:
- The pre-Bötzinger complex contains pacemaker-like neurons and recurrent excitatory networks that set the inspiratory rhythm.
- Respiratory frequency f is the reciprocal of the respiratory cycle period T: f = 1/T, where T = Ti (inspiratory time) + Te (expiratory time).
- Modulating excitatory input to this network (e.g., glutamatergic drive, neuromodulators like substance P) primarily shortens the interburst interval and thus reduces the cycle period, increasing f.

Step-by-step reasoning:
1. Baseline cycle period T = Ti + Te. Frequency f = 1/T.
2. Excitation of pre-Bötzinger neurons increases pacemaker firing rate and recurrent excitation, producing inspiratory bursts more frequently.
3. The dominant change with increased drive is a shortening of the interburst interval, especially Te (time between inspiratory bursts), so T decreases.
4. With T decreased, f = 1/T increases. Thus respiratory frequency rises.

Intermediate calculation example (illustrative):
- Suppose initial Ti = 0.5 s and Te = 2.5 s, so T = 3.0 s and f = 1/3.0 = 0.33 Hz (20 breaths/min).
- Excitation shortens Te to 1.5 s (Ti unchanged): new T = 0.5 + 1.5 = 2.0 s; new f = 1/2.0 = 0.5 Hz (30 breaths/min). Frequency increased.

Why the correct answer is correct:
Exciting the pre-Bötzinger complex accelerates the intrinsic rhythm generator, producing more frequent inspiratory bursts and thus an increased respiratory frequency.

Why other choices are incorrect:
- "A decrease in respiratory frequency": opposite of the network’s response to excitation.
- "An increase in expiratory duration": that would lengthen T and reduce frequency; excitation typically shortens expiratory interval.
- "A decrease in inspiratory duration": excitation does not reliably decrease Ti; frequency increases mainly by shortening Te, not by necessarily decreasing Ti.

Conclusion: The correct result of pre-Bötzinger complex excitation is an increase in respiratory frequency, matching the provided answer: An increase in respiratory frequency.

Excitation of neurons in the pre-Bötzinger complex will result in the following:Single choice

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