Answer:
The first answer is wrong the right answer agonist, antagonist
Explanation:
When the torque (force) produced by the "agonist" exceeds that of the "antagonist", knee extension occurs. it is not produced by an engine or transmission it is the human muscles in the upper leg. Even a baby could understand this. Quote "knee extension occurs"(plz look at the pic below) how could you have missed this.....
hope it helps
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