Motor systems I: Lower systems
Comparison of the force and fatigability of the three different types of motor units. In each case, the response reflects stimulation of a single motor neuron. (A) Change in tension in response to single motor neuron action potentials. (B) Tension in response to repetitive stimulation of the motor neurons. (C) Response to repeated stimulation at a level that evokes maximum tension. The y axis represents the force generated by each stimulus.