Some hair is curly and some is straight due to the shape of the hair follicle from which the hair grows.
The Role of the Hair Follicle
The shape of the hair follicle, a pore in the skin where hair grows, is the key determinant of whether hair will be curly or straight. The way the hair grows out of the follicle dictates the distribution of proteins within the hair shaft, which in turn affects its shape.
How Follicle Shape Affects Hair Shape
- Straight Hair: A straight hair follicle produces straight hair. The proteins within the hair are distributed evenly, leading to a hair shaft that grows straight out.
- Curly Hair: A curved follicle results in curly hair. The uneven distribution of proteins within the hair shaft causes it to bend and curl as it grows out.
| Hair Type | Follicle Shape | Protein Distribution | Resulting Hair Shape |
|---|---|---|---|
| Straight | Straight | Even | Straight |
| Curly | Curved | Uneven | Curly |
In summary, the physical structure of the hair follicle is crucial in determining whether hair grows out straight or curly.
