The Chloride Conductance and its pH Sensitivity in Insect Muscle

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Abstract
The effects of the replacement of chloride with methyl sulfate and of changes in the pH of the extracellular solution on the membrane conductance of locust leg muscle fibers were studied with intracellular electrodes. The contribution of chloride to the membrane conductance varied with the extracellular pH. The membrane conductance was sensitive to change in pH in the standard (chloride) saline, being high in alkaline solution and low in acid solution. However, after replacement of chloride by methyl sulfate the membrane conductance showed little change when pH was altered. It was concluded that chloride ions are mainly concerned in the pH sensitivity of the resting conductance.

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