From the assertion that tetanic contractions are not set up by currents, which option is correct?

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Prepare for the REMBE Electrotherapy Test. Study with flashcards and multiple choice questions. Each question comes with hints and explanations. Master electrotherapy concepts and get ready for your exam!

Multiple Choice

From the assertion that tetanic contractions are not set up by currents, which option is correct?

Explanation:
High-frequency stimulation drives muscle fibers to contract so rapidly that there’s little or no time for relaxation between impulses. The contractions sum together and fuse into a smooth, sustained contraction known as tetanus. That’s why a high-frequency current is the mechanism that produces tetanic contractions. In contrast, low-frequency stimulation sends pulses with enough gap for the muscle to relax between them, so you see separate twitches rather than a fused contraction. Because of this, the low-frequency option wouldn’t produce tetany, and options claiming both or neither don’t fit the observed physiology.

High-frequency stimulation drives muscle fibers to contract so rapidly that there’s little or no time for relaxation between impulses. The contractions sum together and fuse into a smooth, sustained contraction known as tetanus. That’s why a high-frequency current is the mechanism that produces tetanic contractions.

In contrast, low-frequency stimulation sends pulses with enough gap for the muscle to relax between them, so you see separate twitches rather than a fused contraction. Because of this, the low-frequency option wouldn’t produce tetany, and options claiming both or neither don’t fit the observed physiology.

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