Figure 3. An example of the changes in maximal activated tension obtained in a skinned masseter muscle fiber during exposure to 0.75 vol% halothane at pCa 4.8 (pCa =-log Ca⁺⁺concentration). Each exposure to halothane was preceded and followed by determination with the pCa 4.8 control solution alone. Hal 0.75% and R are halothane 0.75 vol% and relaxing solutions, respectively.