Where do action potentials occur in myelinated neurons? In the nodes of Ranvier in the dendrites. In the Schwann cells In the myelin sheaths
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Nodes of Ranvier transmit action potentials and are covered in myelin. They are located at the ends of axons, not dendrites. They do not slow down the nervous impulse, but rather help to speed up the conduction of the action potential. The myelin sheath allows for saltatory conduction, where the action potential jumps from one node to the next. The nodes of Ranvier also play a role in the regeneration of damaged axons. They do not migrate via anterograde movement, as they are stationary structures along the axon.
Madhur L.
Which statement is true regarding myelin sheaths? Myelin sheaths are found only on neurons in the peripheral nervous systems. Myelin sheaths allow for action potentials to be transmitted faster within the dendrites of neurons. The spaces between each myelin sheath are referred to as the Nodes of Ranvier. Collections of myelin sheaths within the nervous system give nerve tissue a dark appearance, which is referred to as gray matter.
Adi S.
In myelinated neurons, the ion exchange of an action potential does not actually occur in myelinated regions of the axon. The nodes of Ranvier are sites where the action potential regenerates. a. Explain why an action potential will not regenerate if the nodes are too far apart (greater than 1.5 mm). (The answer is not because they are too far apart). b. Explain why a demyelinating disease such as multiple sclerosis also causes the action potential to die out and not reach the axon terminal of the neuron.
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