Passive Care Exam 1 Electrical Stimulation Practice Test

Summation of a motor neuron results in which condition?

Tetany Spasm Fatigue Hypotonia

Correct Answer:

Tetany

Explanation:

When a motor neuron fires rapidly, the contractions of the muscle fibers it controls sum up in time. This rapid, repeated stimulation keeps calcium in the muscle cytoplasm and cross-bridges cycling, so the individual twitches fuse into a single, sustained contraction known as tetany (a tetanic contraction). If stimulation is slower, you’d see separate twitches or an unfused tetanus; a spasm is a brief, involuntary contraction not due to sustained summation, fatigue is the decline in ability to maintain contraction due to energy depletion, and hypotonia is low muscle tone at rest. So the summation of a motor neuron results in tetany.

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