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KMID : 0359319910310020171
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Korean Journal of Veterinary Research
1991 Volume.31 No. 2 p.171 ~ p.178
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BiolEffects of catecholamines on the smooth muscle strips of the cattle oesophageal groove
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Abstract
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Effects of catecholamines were investigated on isolated strips of the male cattle oesophageal groove. In the circular muscles of the bottoxn and longitudinal muscles of the lip, isometric tensions was recorded with isometric myograph in 25㎖ organ bath.
The results were as follows:
1. The muscular activity was different in preparations from the two parts. In the longitudinal muscle from the lip, rhythmic contractions generally occurred, while in the circular muscle from the bottom they were not seen almost.
2. In the circular muscle of the bottom, the increased tone and biphasic contractions were caused by catecholamines. And these contractions were mediated through α-excitatory adrenoceptor. Also circular muscle showed minor inhibitory response to catecholamines. And these effects were mediated through β-inhibitory adrenoceptor. But the circular muscle was more sensitive to the α-excitatory effect than β-inhibitory effect.
3. In logitudinal muslce of the lip, rhythmic contractions were reduced or disappeared by catecholamines(especially propranolol) and these effects were mediated through β-adrenoceptor.
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