Involuntary contraction of a single motor unit is known as: (A) Fibrillation, (B) Fasciculation, (C) Tics, (D) Spasm
Answer is B. Fasciculation : It is involuntary contraction of a single motor unit. It is visible grossly.
Fibrillation : It is spontaneous, repititive contraction of a single muscle fibre. It is not visible grossly.