Refer to the Figure Showing the Conduction of an Action

question 83

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.