From the material's perspective, tetanic contraction is linked to which current?

• A. Low Frequency Current
• B. High Frequency Current
• C. Both
• D. Neither

Answer: (A)

The key idea being tested is how the rate of electrical stimulation affects the type of muscle contraction you get. Tetanic contraction is a sustained, fused contraction that results from pulses being delivered in a way that repeatedly activates the muscle before it fully relaxes.

In this material, tetanic contraction is linked to low-frequency current. The reasoning is that such stimulation delivers pulses in a sequence that, over the duration of the train, repeatedly activates motor units enough to produce a continuous, smooth contraction without long pauses between contractions. This is what the material describes as a tetanic response under low-frequency stimulation.

High-frequency current is typically thought of as producing rapid, but not necessarily the same controlled tetanic pattern in this context, and the option that both frequencies cause tetanus isn’t what the material states. This framing helps you focus on how the chosen frequency category relates to achieving a sustained contraction in the material’s terminology.