Question

An action potential traveling along the entire length of an axon demonstrates ________ propagation.

Answer 1

An action potential traveling along the entire length of an axon demonstrates continuous propagation.

Propagation of action potential:

• An action potential is created by the rapid input of Na+ ions and the slightly slower outflow of K+ ions.
• Action potential initiation occurs in the axon's first segment, and as action potentials spread throughout the axon, cells can convey their output to synapses located further distant from the cell.
• The action potential conducts continuously in unmyelinated axons, whereas it conducts rapidly and saltatorily in myelinated axons where sodium channels are concentrated near the nodes of Ranvier.
• The action potential always advances in the same direction whenever a local current begins to form due to the prior axon segment still being in the absolute refractory period. As a result, action potentials travel away from the location of their generation and do not change course.

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