An electrode measures the potential of the inside of a neuron. It also measures the potential difference across the neurons membrane. Electrodes record the activity of a neuron.
We use leeches because it is a simple system that is easy to understand. Leeches have a simple nervous system that obeys some of the same rules that the more complex systems follow. It helps us in understanding the brain.
A sensory neuron transmits nerve impulses to the central nervous system after it has been stimulated. A motor neuron sends nerve impulses away from the central nervous system puts it into to action.
I am really not sure if leeches feel pain, I assume that they do not. Pain is caused from damaged tissue or excess heat or pressure. If they felt pain it is only for a second while they are being pinned to the board.
I thought it was interesting the process of getting the leech ready for the electrode. It was also interesting to see the different effects the various tools have on the neuron.
The most confusing part is finding the information about whether or not the leeches feel pain.
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