Anatomy Practice Exam 2026 - Free Anatomy Practice Questions and Study Guide

Question: 1 / 400

What is the primary role of gaps in the myelin sheath?

To enhance the production of neurotransmitters

To increase nerve impulse transmission speed

The primary role of gaps in the myelin sheath, known as nodes of Ranvier, is to increase nerve impulse transmission speed. These gaps are crucial for a process called saltatory conduction. When a nerve impulse travels along a myelinated axon, it effectively jumps from one node to the next, rather than traversing the entire length of the myelin sheath. This jumping significantly speeds up the electrical signal's transmission, allowing for rapid and efficient communication between neurons.

The presence of these nodes enhances the overall speed of nerve impulses, making it essential for the proper functioning of the nervous system, particularly in pathways demanding quick responses. Non-myelinated sections of the neuron are critical for maintaining the rapid conduction of signals, effectively boosting the efficiency of neuronal communication.

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To protect neurons from damage

To facilitate nutrient supply to neurons

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