Abstract
Extrathoracic trachea! stretch receptors and trachea! tension were recorded in rilru when the trachea was stretched. The receptors responded to an increase in tension produced by displacement in the longitudinal or transverse axis of the trachea. They were sensitive to the rate of change of tension as well as the tension level itself, i.e. there was a dynamic component in the response. A fall in temperature decreased discharge frequency but the receptors were not affected by changes in p co2 and pH of the perfusion fluid. Contraction of tracheal muscle, induced by acetylcholine. increased discharge frequency showing that the receptors studied were effectively in series with the muscle.
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