In saltatory conduction, nerve impulses jump from one exposed region of the axon to another. this exposed region is called the ________.

Nerve impulses jump from one exposed region of the axon to the associated parallel axon, few sites of the axons are exposed referred to as Nodes of Ranvier.

The primary role of the myelin sheath is to conduct the electrical impulses at a higher rate to transmit the electrical impulses. At the uncovered, the conduction of the depolarisation is reduced such that it slows down the entire process of transmission in electrical impulses.

What is the role of Nodes of Ranvier?

It was previously said that electrical signals are sent along an axon by neurons to communicate.

Similar to how rubber or plastic is used to insulate copper electrical cables, myelin acts as insulation for the axon.
Insulation optimizes performance and stops the flow of electrical current.
Neurons also cease to function when their insulation is lost. Demyelination is the loss of myelin.
Action potentials are electrical signals that travel along the axon and must move very quickly.
In a myelinated axon, action potentials can move as quickly as 150 meters per second.
Action potentials can only travel up to 10 meters per second in an unmyelinated axon, though.
Electrical current spills into the extracellular area outside the neuron when the axon is demyelinated, reducing insulation.

Hence, the answer is Nodes of Ranvier.

Learn more about Nodes of Ranvier here,

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