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Precision Induction and Distinction of Coughing and Sneezing Reflexes in Mice

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Perspective on the human cough reflex.

Stuart M Brooks¹

¹Colleges of Public Health and Medicine, University of South Florida, Tampa, Florida. sbrooks@health.usf.edu.

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|November 15, 2011

Summary

This summary is machine-generated.

The human cough reflex evolved into two types: mechanosensory to prevent aspiration and chemosensory for respiratory infections. Both reflexes involve complex neuromuscular coordination for airway protection.

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Area of Science:

Evolutionary biology and human physiology
Neuroscience of respiratory reflexes

Background:

The human cough reflex is a complex protective mechanism with proposed evolutionary origins.
Two distinct pathways, mechanosensory and chemosensory, mediate cough reflexes via different nerve fibers.

Discussion:

Mechanosensory cough, via Aδ fibers, likely evolved to prevent aspiration of gastric or particulate matter, coinciding with the shift towards phonation over olfaction.
Chemosensory cough, via C fibers, may have evolved due to increased risk of respiratory infections and irritant-induced lung injury in communal living.
The chemosensory pathway shares mechanisms with pain signaling, involving TRPV1 and TRPA1 ion channels, crucial for detecting irritants and inflammation.

Key Insights:

The evolution of the larynx and respiratory tract influenced the development of the mechanosensory cough reflex.
TRPV1 and TRPA1 channels are key molecular players in the chemosensory cough reflex, linking irritation to airway protection.
Despite distinct sensory inputs, both cough types utilize identical motor outputs orchestrated by central neural networks.

Outlook:

Further research into the evolutionary pressures shaping the cough reflex can illuminate its role in airway defense.
Understanding the molecular underpinnings of chemosensory cough may reveal novel therapeutic targets for conditions like chronic cough.
Investigating the neural control of cough provides insights into respiratory control and neuromuscular coordination.