photo 2 - ultraviolet image of neuron with dye showing shape
The electrode is measuring the effect of different stimulus on the neurons.
Leeches are used for these experiments because their nerve cords are very large, and the neurons are easily accessible. A sensory neuron transmits impulses to the CNS after a sensory receptor has been stimulated. A motor neuron conducts nerve impulses away from the CNS and innervates muscles and glands. I thought it was very interesting the way some cells responded to certain stimulus while not responding to others at all.
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