猫及兔的活体实验显示:肾上腺素能药物导致瞳孔散大,似为激发α受体的结果,后者可能存在扩瞳肌中。但离体猫的括约肌及扩瞳肌的研究,发现二者具有双重肾上腺能受体:在扩瞳肌中,α受体占优势,但在括约肌中则为β受体,猫的睫状肌也有两种受体,而β受体占优势。但兔及猴的眼内肌受体,与猫有所不同。为便于比较种别差异,作者将有关结果报 Cats and rabbits in vivo experiments show: adrenergic drugs cause mydriasis, seems to be excited α receptor results, the latter may exist in pupil pupil. However, the study of isolated cat’s sphincter and dilated pupil showed that both of them had dual adrenergic receptors: α receptors were predominant in dilated pupils, β receptors in sphincter and cat’s ciliary muscles There are also two receptors, while beta receptors predominate. But rabbits and monkeys eye muscle receptors, and cats are different. To facilitate comparison of species differences, the author will report the results