In an experiment, it was determined that the motor (effector) neuron for muscle fibre 1 had a threshold level of – 5 mV. The motor (effec neuron for muscle fibre 2 had a threshold level of –16 mV. An electrical probe was used to stimulate these two effector neurons of the muscle fibres. Which of the following rows correctly identifies the reaction of each muscle fibre based on the applied stimulus voltage? Select one: а. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 -10 mV Contracted Relaxed b. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 -20 mV Relaxed Contracted с. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 -10 mV Relaxed Contracted d. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 - 20 mV Contracted Relaxed

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