1) What is the name of the white substance that surrounds axons? a) Dendrites b) Gilia c) Myelin 2) Which of these are not a function of neuroglia cells? a) Provide support and protection to nerve cells b) The can be found in the blood brain barrier c) They help speed up electrical impulses by maintaining myelin d) They bundle nerve cells together 3) What is the purpose of the Node of Ranvier? a) They help ions such as Sodium pass in and out of the axon b) They support the action potential travel through the axon c) They are gaps in the myelin layers d) All answers in the question

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