In a myelinated nerve, all of the following are true EXCEPT A) Na⁺ enters the axon and K⁺ leaves the axon during the action potential B) The Na,K-ATPase continually re-establishes the Na⁺ and K⁺ gradients C) Na⁺ influx occurs mainly at the nodes of Ranvier D) The Na⁺ flux in a single action potential significantly changes axoplasmic [Na⁺] ( 5%) E) None of the above

Question

In a myelinated nerve, all of the following are true EXCEPT A) Na⁺ enters the axon and K⁺ leaves the axon during the action potential B) The Na,K-ATPase continually re-establishes the Na⁺ and K⁺ gradients C) Na⁺ influx occurs mainly at the nodes of Ranvier D) The Na⁺ flux in a single action potential significantly changes axoplasmic [Na⁺] (> 5%) E) None of the above

Quizplus · Accepted Answer

The Na+ flux during a single action potential does not significantly change the axoplasmic concentration of Na+; the change is much less than 5%.

In a Myelinated Nerve, All of the Following Are True