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Hair
Shape
The
amount of natural curl a hair has is determined by it's cross-sectional
shape. Hair that is most similar to a circle is straight and hair
that is flattened and elliptical is curly or kinky. The more circular
the shaft is, the straighter it is. The more elliptical the shaft
is, the curlier or kinkier the hair. The cross-sectional shape also
determines the amount of shine the hair has. Straighter hair is
shinier because sebum from the sebaceous gland can travel down the
hair more easily. The kinkier the hair, the more difficulty the
sebum has traveling down the hair, therefore the more dry or dull
the hair looks.
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