How do certain hairs on our bodies (for example, on legs) know what length to stop growing at?
In: Biology
The cells in hair roots are not always active. When they are active, hair grows, and then the cells rest some time, which makes the hair “die” and drop. Then after some time they start growing a new hair. The length of the active time varies between different kinds of hair roots and the longer it is, the longer the hair.
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