In an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with one muscle fibre is observed in this

In an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with one muscle fibre is observed in this experiment. One end of the muscle fibre is attached to a mass. The following data were obtained from the experiment. Number of Trials Strength of Stimulus (mV) Mass Lifted by Muscle Contraction (g) 1 20 0 2 40 0 3 60 50 4 80 50 5 100 Not Tested 6 120 50 Is the threshold potential for this muscle fibre exactly 50 mV. Do you agree or disagree? Explain.