Which of the following statements concerning propagation of action potentials is incorrect?
A) saltatory conduction occurs in myelinated nerve fibers.
B) during conduction by local current flow, there is a flow of current between the active and adjacent inactive area of the cell membrane, thereby decreasing the potential in the inactive area to threshold.
C) the action potential jumps from one Schwann cell to the adjacent Schwann cell in a myelinated fiber.
D) saltatory conduction is faster than conduction by local current flow.
E) conduction by local current flow is the method of propagation in unmyelinated fibers.

Question

Quizplus · Accepted Answer

Action potentials do not jump from one Schwann cell to the adjacent Schwann cell in a myelinated fiber. Instead, they jump from one node of Ranvier to the next. This is known as saltatory conduction, which is faster than conduction by local current flow, the method of propagation in unmyelinated fibers. During conduction by local current flow, there is a flow of current between the active and adjacent inactive area of the cell membrane, decreasing the potential in the inactive area to threshold.

Which of the Following Statements Concerning Propagation of Action Potentials