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electrical
tough one to answer really, as all three will give you different nerve conduction velocitys to a stimulus. the unmyelinated rat nerve will obviously be the least conductive, the frog nerve more conductive than that and the myelinated rat nerve more conductive again. But in general, tha main consensus would use a frog nerve, as the frog has been the choice of many a physiology lab for who knows how long.
The stimulus that you would use to study nerve physiology would be internal and external stimulus to the body. The study of the nervous system would help in analyzing the human anatomy.
ELectrical
Hoffman's sign in physiology is a sign of nerve regeneration triggered by a stimulus of the distal part of an injured nerve.
Electric Shock. Nerves can be stimulated by chemicals, touch, or electric shock. Electronic shock allows for the duration, frequency, and voltage of the shock to be precisely controlled.
For my class, We used to use electrical shock (Voltage) as a stimulus. However, there are some other types as well, such as mechanical (glass rod), or thermal stimulation (heat a glass bar).
To study the physiology of nerve fibers, you would need to isolate a specific muscle and the nerve innervating that muscle. This allows for the investigation of the interaction between the nerve and muscle, observing the transmission of signals and studying the response of the muscle to nerve stimulation. Commonly studied muscles and nerves in this context include the gastrocnemius muscle and the sciatic nerve in animal models.
A sensory Neuron picks up the stimulus from the environment and changes it into a nerve impulse.
It depends on the strength of the stimulus. A threshold voltage has to be reached before the nerve can be stimulated.
Signals to which the body reacts.
Stimulus