Straight hair is straight because of the shape of the hair follicle from which it grows.
Here's a breakdown:
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Follicle Shape: The primary factor determining hair straightness is the shape of the hair follicle located in the scalp.
- Symmetrical and Round Follicles: Straight hair grows from follicles that are generally symmetrical and round in shape. This shape causes the hair to emerge in a straight line.
- Perpendicular to the Scalp: Straight hair follicles tend to be oriented perpendicular (at a 90-degree angle) to the surface of the scalp. This further contributes to the straight growth pattern.
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Protein Distribution: The distribution of keratin proteins within the hair shaft also plays a role. In straight hair, the proteins are more evenly distributed throughout the strand.
In summary, the combination of a symmetrical, round hair follicle that is perpendicular to the scalp, along with an even distribution of keratin proteins, results in hair that grows straight.
