Refer to the Figure Showing the Conduction of an Action

Multiple Choice

Refer to the figure showing the conduction of an action potential traveling from left to right in a myelinated axon.Note the action potential at node 2. Which statement about section 2 of the axon is true?

A) Depolarization is caused here by the opening of voltage-gated K⁺ channels.
B) The speed of the action potential in this axon depends mostly on its diameter.
C) Na⁺ channels remain open here until the action potential has reached the axon terminal.
D) A loss of signal will occur as the action potential travels to each adjacent node.
E) Na⁺ channels will inactivate at this node and enter a refractory state.