The mechanical force generated by a contracting muscle is ____.

A) muscle fatigue
B) a motor unit
C) muscle tension
D) a muscle twitch
E) tetanus

Muscle tension is the force generated by a contracting muscle. Muscle fatigue is a decrease in muscle performance due to prolonged exertion. A motor unit is a motor neuron and all of the muscle fibers it innervates. A muscle twitch is a single contraction-relaxation cycle of a muscle fiber. Tetanus is a sustained contraction of a muscle due to rapid, repeated stimulation.