';Different hair fiber types are produced by different hair follicles. Large straight hair follicles with a circular cross section produce thick straight hair. Curly flat hair follicles make curly elliptical or ribbon shaped cross section hair. Most African Americans have very curly, flattened hair follicles in their skin that produce the highly coiled hair. Some research suggests that the hair follicles are actually spiral/spring shaped if you were able to look down the length of these hair follicles.
The shape of the hair follicle acts as a mold for the creation of the hair fiber. Deep in the hair follicle, where cells are added to the fiber at the root, the hair is soft and pliable. The cells of the fiber take the shape of the surrounding hair follicle sheath. As the cells are squashed together and keratinized, the chemical bonds form and hold the hair fiber into the shape of the hair follicle. Hence curly hair follicles make curly hair fibers. Don't ask what makes curly hair follicles because we don't know.';What is the difference between curly hair and straight hair? Why are the textures so different?
There麓s a link that answers your question:
http://www.madsci.org/posts/archives/oct98/908952105.An.r.html
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