摘要
本文研究了低温对刺猬(冬眠动物)皮肌和膈肌离体肌条对单次电刺激的等张收缩反应幅度、收缩期、半舒张期和静息肌张力的影响,并同豚鼠(非冬眠动物)的相应肌肉作比较。证实了冬眠动物的肌肉具有较强的耐低温性。首次观测到刺猬皮肌的静息肌张力在低温中自发增强,提示这是一种肌源性的反应。与之相反,刺猬膈肌的静息肌张力在低温中显著降低。文章论证了这两种相反的变化对刺猬冬眠的生理适应意义。豚鼠两种肌肉的静息肌张力几乎都不受低温的影响。上述结果为刺猬冬眠的生物学和肌肉的比较生理学研究提供了新的信息。
In the present the effects of low temperature on the electric stimulus-induced isotonic twitch amplitude, contractile duration, semi-relaxation time and resting tension of cutaneous muscles and diaphragm from hedgehog (HCM, HDM, a hibernator) and guinea pig (GPCM, GPDM, a non-hibernator) was investigated. Seven steps of incubation tempertures, ranging ffrom 35℃ to 5℃, were used. On the responses to electric stimulus GPCM and GPDM decreased more steeply than HCM and HDM as the temperature lower down and become un-responsive at 5℃, howevwr the twitch amplitudes of HCM and HDM remained on the level of 40% and 60% of that at 35℃ respectovely. HCM and HDM could revive the contractile properties when the incubation temperature reversed from 5℃ or lower, but in on case did it occur among muscles of guinea pig. It was noticed that the resting tension of HCM enhanced markedly when the incubation temperature was lowered than 20℃ and this tension is thought to be a myogenic cold adaptaion. On the contrary, the restung tension of HDM became more relaxed when the temperature droppd downward. The resting tensions of both GPCM and GPDM wete not temperature dependent. These results suggest that this phylogenetic cold adaptation maybe in favour of the survival of hedgehog in hibernation.
出处
《中国应用生理学杂志》
CAS
CSCD
1989年第4期354-358,共5页
Chinese Journal of Applied Physiology
关键词
低温
冬眠
肌肉收缩
刺猬
hibernation
low temperature
contraction
tension
wyogenic
