Skin Spinal cord 2 A neuron was isolated from structure number 3 in the diagram above. When comparing the velocity of action potentials, structure numbered 3 is much slower than that of structure numbered 4. Which of the following explains why this is? Select one: a. Structure number 4 has a larger diameter than structure number 2. b. Structure number 4 does not have myelin sheaths. c. Structure number 3 does not have myelin sheaths. d. Structure number 3 has a larger diameter than structure number 4.

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