[Adrenoreactivity of different portions of the vas deferens in the rat].

Adrenoreactivity of rat vas deferens was shown to vary along its length. These variations are manifested in a greater reaction of epididymal part to adrenomimetic substances and transmural stimulation and are due to a higher sensitivity and greater number of alpha-adrenoreceptors in the epididymal part. Different populations of alpha-adrenoreceptors seem to exist in the rat vas deferens, with the population of receptors having a greater affinity for noradrenaline concentrated in the epididymal part.