The follicle in straight hair is typically:

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Multiple Choice

The follicle in straight hair is typically:

Explanation:
The shape of the hair follicle influences how a hair shaft grows. When the follicle is round, the hair grows straight because there’s no built-in asymmetry or bend guiding the strand to curl. A round cross-section means the hair exits the follicle evenly in all directions, producing a smooth, straight shaft. In contrast, more elongated (elliptical) or flattened follicles create uneven growth and twists that lead to waves or curls, and a curved follicle can bend the shaft as it emerges. So for straight hair, a round follicle is typical and best explains why the hair grows straight rather than curled.

The shape of the hair follicle influences how a hair shaft grows. When the follicle is round, the hair grows straight because there’s no built-in asymmetry or bend guiding the strand to curl. A round cross-section means the hair exits the follicle evenly in all directions, producing a smooth, straight shaft. In contrast, more elongated (elliptical) or flattened follicles create uneven growth and twists that lead to waves or curls, and a curved follicle can bend the shaft as it emerges. So for straight hair, a round follicle is typical and best explains why the hair grows straight rather than curled.

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