Calcium sparks.
D000818:Animals; D020013:Calcium Signaling / Q000502:physiology*; D004594:Electrophysiology; D006331:Heart Diseases / Q000503:physiopathology; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology; D009130:Muscle, Smooth / Q000502:physiology; D009474:Neurons / Q000502:physiology