The influence of extreme temperatures on metabolic substances in the hemolymph and foot muscle of Helix pomatia

1. 1. The hemolymph of Helix pomatia subjected to a 1-hr temperature rise from an adaptation temperature (AT) of 20°C to 43°C shows, when examined at intervals of 1 and 24 hr after return to 20°C, at least a temporary increase in the freezing-point depression and also a rise in the concentrations of K, Ca, glucose, NPS and protein. 2. 2. In the case of lowering the temperature to 0°C only rises in glucose and NPS concentrations are found. 3. 3. After both temperature changes the pH value and Na concentration fall in the hemolymph, and in the foot muscle the LDH activity becomes greater. 4. 4. In the hemolymph of heat- (50°C) and cold-killed (−10°C) snails the concentration of K, NPS and glucose are conformably higher, and the Na concentration and pH value are lower in comparison to those at 20°C. 5. 5. The other measured values in the hemolymph generally tend at heat death to increase, however, at cold death they decrease. In the foot muscle the Na intake stands over against a greater K efflux at heat and cold death.