Sample from class textbook:
Circadian Rhythms
Resources:
Sample Textbook material
Textbook writing tutorial
Textbook Writing 101 [another version]
How to Make a Textbook Chapter Outline
Textbook Outline
It may be useful to look at work done by people on how to use narrative when conveying scientific information.
Here is an example from our online catalog.
Houston, we have a narrative : why science needs story