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In unmyelinated fibres, the rate of travel of action potential is
Option: 1
Option: 2
Option: 3
Option: 4
Answers (1)
As we have learnt in Saltatory Conduction & All-or-None Principle of Nerve Impulse
- If an axon is unmyelinated, an action potential at one locale stimulates an adjacent part of the axon membrane to produce an action potential.
- In myelinated fibres, an action potential at one node of Ranvier causes an action potential at the next node.
- This is called saltation.
- This type of conduction, called saltatory conduction, is much faster than otherwise.
- In thin, unmyelinated axons, the action potential travels about 1.0 m/sec, and in thick, myelinated fibres, the rate is more than 100 m/sec.
- The conduction of a nerve impulse (action potential) is an all-or-none event; that is, either an axon conducts a nerve impulse or it does not.
- The intensity of a message is determined by how many nerve impulses are generated within a given time span.
-
Therefore, in thin, unmyelinated axons, the action potential travels about , and in thick, myelinated fibres, the rate is more than
. Hence, the correct answer is option a.
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