Penetration of horseradish peroxidase into the terminal cisternae of frog skeletal muscle fibers and blockade of caffeine contracture by Ca ++ depletion.

Animals Anura Caffeine/antagonists & inhibitors Calcium/metabolism Depression, Chemical Extracellular Space In Vitro Techniques Microscopy, Electron Muscle Contraction/drug effects Muscle Tonus/drug effects Muscles/cytology Myofibrils/enzymology Peroxidases/administration & dosage,metabolism Pinocytosis Rana pipiens Sarcolemma Sarcoplasmic Reticulum Statistics as Topic Stimulation, Chemical Time Factors

Caffeine Peroxidases Calcium