In a large pipe, while the water on the edges experiences the resistance, there is a lot of water in the middle that can travel at this faster pace. Because it doesn't experience this resistance, it can travel at a faster speed. The water that isn't touching the sides of the pipe (so, the water in the middle) is not in contact with the pipe surface and so it does not experience that resistance from friction. The water that is touching the side of the pipe experiences resistance (from friction) that slows it down. Because the resistance is lower, the larger the axon's diameter, the faster the action potential can be transmitted.Ī good way to think about it is to imagine water flowing through a pipe with a small diameter as compared to one with a large diameter. Resistance within an axon is inversely proportional to the axon's diameter.
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