Abstract
Intravenous injections of potassium chloride were given to anaesthetised cats to produce rises in arterial plasma potassium within the range of those occuring in man during exercise. Carotid chemo-receptor activity was recorded as action potentials from a single or few fibre preparation of the right sinus nerve. Arterial potassium was recorded continuosly using a potassium electrode placed in the abdomial aorta. In response to the potassium injections there was an increase in carotid chemoreceptor activity, which closely followed the arterial potassium concentration, and an increase in ventilation. It is suggested that potassium released from muscle may be an important drive to ventilation in exercise.
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