What Would Probably Happen If a Long Neuron Had One

question 43

Multiple Choice

What would probably happen if a long neuron had one continuous myelin sheath down the length of the axon with no nodes of Ranvier?

• A) The action potential would be propagated nearly instantaneously to the synapse.
• B) There could be no action potential generated at the axon hillock.
• C) The signal would fade because it is not renewed by the opening of more sodium channels.
• D) Only potassium could move across the membrane, but not sodium.

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Definitions:

Pitch Diameter

The diameter of an imaginary cylindrical surface delimited by the points where the teeth of a gear or thread profile make contact with the corresponding parts of another gear or thread.

Outside Diameter

The measurement of the distance across the widest point of a cylindrical or round object's exterior.

Root Diameter

The diameter at the bottom of a screw thread or gear tooth.

Pitch Diameter

The diameter of an imaginary circle on a gear, where the teeth effectively engage with the teeth of another gear.