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 this axon is false? A) Area 1 is a node of Ranvier. B) An action potential will be triggered at node 3 as a result of the action potential occurring at node 2. C) Action potentials can jump rapidly from node 1 to node 2. D) An action potential traveling from left to right will leave node 1 refractory because its Na⁺ channels are still open. E) Node 1 participates in saltatory conduction.

Question

Quizplus · Accepted Answer

Node 1 is a node of Ranvier and participates in saltatory conduction, but an action potential will not leave it refractory because its Na+ channels have already closed by the time the action potential reaches node 2. Rather, the refractory period occurs at node 2 due to the activation of Na+ and K+ channels. Therefore, statement D is false.

Refer to the Figure Showing the Conduction of an Action