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:

Trancelike State

A state of consciousness that involves focused attention, reduced peripheral awareness, and an enhanced capacity for response to suggestion.

Conscious Awareness

The state of being aware of and able to think about one's own thoughts, feelings, and perceptions in the moment.

Stimulant

A substance that raises levels of physiological or nervous activity in the body.

Mental Activity

Processes of the mind that include thinking, perceiving, remembering, reasoning, and any other form of cerebral operation.