Abstract
In pentobarbitone-anesthetized rabbits, intracarotid injections of acetylcholine (ACh, 3–30 μg) during inspiration led to an inhibition of internal intercostal muscle activity (IIMA). After the section of the carotid sinus nerve (CSN), ACh-induced inhibitory responses in IIMA were abolished. In addition, changes of the rabbit carotid chemoreceptor activity were studied by ACh (3–30 μg) given into the carotid body region during inspiration. Spontaneous chemoreceptor activity was inhibited in a dose-dependent manner by ACh. These results suggest that the inhibitory responses of IIMA to ACh are probably mediated through the carotid chemoreceptor reflexes.
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