When the torque (force) produced by the exceeds that of the , knee extension occurs.

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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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.