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Central Nervous System

4 out of 9

Which of the following is the twitch of a single motor unit?

A Chorea
B Fasciculation

C Tremor
D Myoclonic jerk

Ans. B Fasciculation

When an abnormal impulse occurs in a motor nerve fiber its whole motor unit contracts. This often causes sufficient contraction in the muscle that one can see a slight ripple in the skin over the muscle. This is known as fasciculation.