By J.W.L. Beament
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Additional info for Advances in Insect Physiology, Vol. 4
1960). Is muscle contraction initiated by internal current flow? J. Physiol. 151, 363-384. Takeuchi, A. and Takeuchi, N. (1960). On the permeability of the end-plate membrane during the action of transmitter. J. Physiol. 154, 52-67. Treherne, J. E. (1965). Some preliminary observations on the effects of cations on conduction processes in the abdominal nerve cord of the stick insect, Carausius morosus. J. exp. Biol. 42, 1-6. Usherwood, P. N. R. (1961). Spontaneous miniature potentials from insect muscle fibres.
1949). The effect of sodium ions on the electrical activity of the giant axon of the squid. J. Physiol. 108,37-77. (1953). Potassium ions and insect nerve muscle. J. exp. Biol. 30,121-135. Hoyle, G . (1955a). The anatomy and innervation of locust skeletal muscle. Proc. R. B 143,281-292. Hoyle, G. (1955b). Neuromuscular mechanisms of a locust skeletal muscle. Proc. R. B 143,343-367. Hoyle, G. (195%). The effects of some common cations on neuromuscular transmission in insects. J. Physiol. 127, 90-103.
J. A I D L E Y If the amplitude of the electrical response to nervous stimulation is reduced by means of neuromuscular blocking agents, the twitch tension is also reduced, as is shown in Fig. 4. Perfusion of a muscle with salines containing high potassium ion concentrations causes depolarization and contraction. In the metathoracic spiracular muscle of locusts (Hoyle, 1961), the threshold for the development of this contracture occurs at a potassium ion concentration of about 30 m~ (membrane potential - 34 mv) ; contracture tension increases with increasing potassium ion concentration to reach the maximum level at about 70 m~ (membrane potential - 18 mv).
Advances in Insect Physiology, Vol. 4 by J.W.L. Beament