Abstract
Summary.Adrenaline apnoea is increased by inhalation of oxygen. It can be decreased more or less, if the animal is breathing gas mixtures poor in oxygen or rich in carbon dioxide.During the apnoea, the chemical impulses from the sinus nerve are greatly reduced in number. Respiration can be depressed or apnoea provoked if the vagi and the sinus nerves are cut within a short time of each other.The results obtained cannot be reconciled with the hypothesis that adrenaline apnoea is due to a direct inhibition from the baroceptors of the sinus and aortic regions. In our opinion, adrenaline apnoea is the result of a reduction of the activity of the chemoreceptors.
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