Myelin

High school (ages 12+)
Human Body

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/myelin

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the biochemical composition?Approximately 70-85% lipid, 15-30% protein; rich in cholesterol, phospholipids, and glycolipids
2. What is the CNS myelinating cell?Oligodendrocytes, capable of myelinating multiple axons
3. What is myelin and why does it help my brain send messages fast?Myelin is a fatty coating that wraps around nerve fibers. It insulates the fibers so signals can jump quickly from one spot to another, making messages travel super fast.
4. How does myelin make signals travel faster than without it?Myelin creates gaps called nodes of Ranvier. The signal jumps from one node to the next, skipping large parts of the nerve and speeding up the journey.

Action Potential: A rapid rise and fall in electrical potential across a neuron's membrane, transmitting a signal.
Glial Cells: Non-neuronal cells in the nervous system that provide support, insulation, and protection to neurons.
Internode: The segment of an axon covered by a myelin sheath, located between two nodes of Ranvier.