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Non myelinated axon differ from myelinated axons in that they are

Non myelinated axon differ from myelinated axons in that they are Correct Answer Less excitable, Refractory for a longer period after excitation

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Consider the following statements in respect of slow sand filter and rapid sand filter: 1. The two filters differ in respect of the standards regarding the non-uniformity of the sand used in their filtering media. 2. The two filters do not differ in respect of the effective size of the sand used in them. 3. The two filters differ in respect of their respective under-drainage system. 4. The two filters differ in respect of their respective rate of filtration. Which of the above statements are correct? 
Which of these structures is present in both non-myelinated and myelinated neurons?
In CNS myelinated fibers form the __________ while non myelinated fibers cells form the ___________
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