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Journal of Experimental Biology 86,249-258 (1980)
Published by Company of Biologists 1980

The Electrical Constants of the Skeletal Muscle Fibres of the Stick Insect, Carausius Morosus

FRANCES M. ASHCROFT 1

1 Department of Physiology, University of Leicester Present address: LE1 7RH, England

The electrical constants of the ventral longitudinal muscle fibres of the stick insect Carausius morosus were determined by analysing the low-frequency cable properties of the fibre using short cable theory. At 20 °C in normal Ringer the membrane conductance (Gm) was 0.32 mmho.cm2, the sarcoplasmic conductivity (Gl) was 6.69 mmho/cm2 and the membrane capacity (Cm) was 12.2µF/cm2. In this solution the length constant ({lambda}) was 2.13 mm and averaged 130% of the fibre length. Hypertonic ( x 2) Ringers had no significant effect on Gi but increased the membrane conductance by about 35%. The effect of temperature on the electrical constants was also investigated: the temperature coefficient (Q10) of Gm was 1.44 and that of Gi was 1.41. The Q10 of the membrane capacity was 1.11.

Submitted on August 21, 1979






© The Company of Biologists Ltd 1980