QUESTIONS ABOUT LEECH NEUROPHYSIOLOGY LAB:
Figure 1: Picture of manipulator with the oscillope trace to find a cell in the dissected leech.
Figure 2: Picture of shape of sensory neuron found by the oscillope trace. The cell was dyed and viewed with an ulra-violet light.
1. What is the electrode measuring?
The electrode is measuring the activity of the neurons by establishing electrical contact with a non-metallic substance.
2. Why use leeches in neurophysiology experiments?
The reason why leaches are being used in this neurophysiology experiment and others is, they have a simple system. This simple system is easier to understand than the system of humans. And, the facts that are discovered within the simple system, like the leech, may be applied to understanding the human brain.
3. What is the difference between a sensory and a motor neuron?
The difference between a sensory neuron and a motor neuron is that a nerve cell that a sensory neuron conducts impulses from a sense organ to the central nervous system, whereas a motor neuron conveys impulses from the central nervous system to a muscle, gland, or other effector tissue.
4. Do you think a leech experiences pain? What is pain?
Yes, I think leeches experience pain, because they contain nerve cells that collect touch information from the skin and transmit to the brain for interpretation. But, in this experiment, the leech is placed into an anesthetic, so maybe it did not feel the pain in the experiment. Pain is a distressing sensation in a particular part of the body that is felt by nerve fibers that send the message of distress up the spinal chord and into the brain for interpretation.
5. What were the two most interesting things about doing this lab?
The two most interesting things about doing this lab were the dissecting of the leech and the dyeing of the cell in order to see the neuron in the UV light.
6. Anything you found confusing or didn't like about the lab?
I did not find anything confusing or anything that I did not like about the lab. It was very simple and fun.
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