Charge movement and depolarization-contraction coupling in arthropod vs. vertebrate skeletal muscle.
Voltage-dependent charge movement has been characterized in arthropod skeletal muscle. Charge movement in scorpion (Centuroides sculpturatus) muscle is distinguishable from that in vertebrate skeletal muscle by criteria of kinetics, voltage dependence, and pharmacology. The function of scorpion charge movement is gating of calcium channels in the sarcolemma, and depolarization-contraction coupling relies on calcium influx through these channels.
D000818:Animals; D001464:Barium / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D066298:In Vitro Techniques; D007473:Ion Channels / Q000502:physiology; D007700:Kinetics; D009119:Muscle Contraction; D009132:Muscles / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism; D012605:Scorpions; D012964:Sodium / Q000378:metabolism
D007473:Ion Channels; D001464:Barium; D012964:Sodium; D011188:Potassium; D002118:Calcium