Acid Sensing Ion Channels Acid-sensing ion channels Animals Behavior, Animal Electric Stimulation Evoked Potentials, Motor Extracellular acidosis Female Hand Strength Hydrogen-Ion Concentration Male Mice Mice, Knockout Motor Endplate Motor Neurons Motor nerve transmission Muscle Contraction Muscle Fatigue Muscle, Skeletal Neuromuscular Junction Presynaptic Terminals Presynaptic modulation Sex Factors Synaptic Transmission Time Factors Wire hanging acid-sensing ion channels extracellular acidosis motor nerve transmission presynaptic modulation