Question

During saltatory action potential propagation:

A. action potentials move in all directions along an axon

B. action potentials occur at successive nodes along the length of the stimulated axon

C. local currents depolarize adjacent areas of membrane so that action potentials continue to form along the membrane

D. action potentials produce a local current that is strong enough to spread along the length of the axon

E. local potentials produce a continuous outward flow of potassium ions

Answer 1

During saltatory action potential propagation,

The correct option is "B" i.e, action potentials occur at successive nodes along the length of the stimulated axon.

Explanation- Saltatory conduction is the propagation of action potentials along myelinated axons from one node of Ranvier to the next node, increasing the conduction velocity of action potentials. It minimises the length of the axon that needs to depolarise in order for an action potential to propagate. This reduces energy used and makes action potentials travel much faster than in unmyelinated axons