Twitch of a single motor unit is called: (A) Myoclonic jerk, (B) Fasciculation, (C) Tremor, (D) Fibrillation
Answer is B. Contraction of a single muscle fiber is called fibrillation.Involuntary contractions of individual motor units are termed as fasciculations.Ref: Robbin&;s&; 9th edition; Chapter 28 The Central Nervous System