Some Nerves Are Myelinated, and Others Are Not

question 55

Essay

Some nerves are myelinated, and others are not. Myelinated nerves send signals faster than unmyelinated neurons. Draw two neurons of equal length, and wrap segments of myelin along one. Be careful to leave spaces for the nodes of Ranvier. Now, measure the exposed axons of each, and total up the distance. Describe why the myelinated neurons send signals faster.

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Definitions:

Oxygen Extracted

The process of removing oxygen from a compound or an environment, often to produce a specific chemical reaction.

Spiracles

Small openings on the surface of some animals, like insects, that lead to the respiratory system, allowing gas exchange.

Ventilate

To provide with a supply of fresh air by allowing air to flow through a space, often through natural or mechanical means.

Respire

The process by which living organisms take in oxygen and release carbon dioxide, involved in energy production.