Which of the following statements best describes saltatory...

Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier and thus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynaptic membrane. d. It decreases neurotransmitter uptake at chemically gated postsynaptic channels. e.It removes neurotransmitters from the synaptic cleft.

Which of the following statements best describes saltatory conduction?
a. It inhibits direct neurotransmitter release.
b. It transmits the action potential at the nodes of Ranvier and thus speeds up impulses on myelinated axons.
c. It increases neurotransmitter release at the presynaptic membrane.
d. It decreases neurotransmitter uptake at chemically gated postsynaptic channels.
e.It removes neurotransmitters from the synaptic cleft.

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Key Concepts

Saltatory Conduction

Saltatory conduction is a mode of electrical impulse propagation in neurons where the action potential 'jumps' from one node of Ranvier to the next along a myelinated axon. This jumping mechanism greatly increases the speed of signal transmission compared to continuous conduction along unmyelinated fibers.

Myelin Sheath

The myelin sheath is a fatty layer that surrounds the axons of many neurons, acting as an electrical insulator. It prevents the leakage of electrical current and thereby facilitates faster signal conduction through saltatory conduction.

Nodes of Ranvier

Nodes of Ranvier are small gaps in the myelin sheath along the axon where the neuronal membrane is exposed. These nodes are the sites where the regenerative action potential occurs, allowing the signal to effectively leap between nodes, which is essential for rapid communication in the nervous system.

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