SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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along myelinated axons it moves at a speed of about 18-140 meters per second (18-140 mph)
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along unmyelinated axons it moves at a speed of about 1 meter per second (2 mph)
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the spread of action potential down the axon
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None of the above
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Detailed explanation-1: -Propagation. The action potential generated at the axon hillock propagates as a wave along the axon. The currents flowing inwards at a point on the axon during an action potential spread out along the axon, and depolarize the adjacent sections of its membrane.
Detailed explanation-2: -Propagation of action potential An action potential is generated in the body of the neuron and propagated through its axon. Propagation doesn’t decrease or affect the quality of the action potential in any way, so that the target tissue gets the same impulse no matter how far they are from neuronal body.
Detailed explanation-3: -Action potentials travel down the axon by jumping from one node to the next. Nodes of Ranvier are gaps in the myelin along the axons; they contain sodium and potassium ion channels, allowing the action potential to travel quickly down the axon by jumping from one node to the next.