A Node of Ranvier (Myelin Sheath Gap)

question 11

Multiple Choice

A node of Ranvier (myelin sheath gap)

• A) occurs only in ganglia.
• B) is one segment of the myelin sheath.
• C) occurs in the PNS but not in the CNS.
• D) is a bare region of axonal membrane in myelinated axons only.

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Definitions:

Membrane Depolarization

The process by which a cell's membrane potential becomes less negative (or more positive), often leading to the initiation of an action potential in neurons.

Hyperpolarization

An increase in a cell's membrane potential, making it more negative and less likely to initiate an action potential.

Degradation

The process of breaking down or decomposing substances into simpler forms, as in the breakdown of proteins into amino acids.

Synaptic Cleft

A gap between two nerve cells where neurotransmitters are released from the presynaptic neuron to send signals to the postsynaptic neuron.