High School

Does the force generated by the muscle change with each additional stimulus?

A. As the stimulus frequency increased, the muscle tension generated by each successive stimulus also increased and there was no limit to this increase.

B. As the stimulus frequency increased, the muscle tension generated by each successive stimulus also increased, and a limiting maximum value was observed.

C. As the stimulus frequency increased, the muscle tension generated by each successive stimulus remained the same.

D. As the stimulus frequency increased, the muscle tension generated by each successive stimulus always decreased.

Answer :

Final answer:

As the frequency of motor neuron signaling increases, the muscle tension in the motor unit also increases until it reaches a peak. This state is known as incomplete tetanus. If the stimulus frequency is high enough, the muscle contractions become continuous in a process called complete tetanus (option d).

Explanation:

If the frequency of motor neuron signaling increases, summation and subsequent muscle tension in the motor unit continues to rise until it reaches a peak point. The tension at this point is about three to four times greater than the tension of a single twitch, a state referred to as incomplete tetanus.

During incomplete tetanus, the muscle goes through quick cycles of contraction with a short relaxation phase for each. If the stimulus frequency is so high that the relaxation phase disappears completely, contractions become continuous in a process called complete tetanus (Figure 10.16b).

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