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Journal of Experimental Biology 47,481-484 (1967)
Published by Company of Biologists 1967

Temperature Acclimation of the Functional Parameters of the Giant Nerve Fibres in Lumbricus Terrestris L : II. The Refractory Period

ANTTI TALO ¹ and KARI Y. H. LAGERSPERTZ ²

¹ Zoophysiological Laboratory, Department of Zoology, University of Turku, Finland
² Zoophysiological Laboratory, Deparetment of Zoology, University of Turku, Finland

1. The temperature dependence of the absolute refractory period and of the maximum response frequency was studied in the median and lateral giant fibres of the nerve cord of earthworms acclimated to 13° or 23° C.

2. Compensatory acclimation of the absolute refractory period in the median giant fibre was statistically significant at 6° and 13° C. The temperature coefficient Q₁₀) was significantly lower in cold-acclimated animals.

3. Compensatory acclimation of the maximum response frequency was significant at 6° C. The ratio between the minimum impulse interval and the absolute refractory period was about 2.2. It was unaltered by temperature acclimation.