Why does the hair on the head grow and the hair on the arms stays short?

In Science Daily Online we talk once about a lunar scenario of Star Wars in Tunisia, this time we want to look, to start, in one of the characters of this famous saga: Chewbacca.If the hair of the body, of the arms for example, we would grow as much as we have in the head, would we not look more like him? Why doesn't this happen? How is it possible that the hairs of our arms are kept in the same way always ?

Wise follicles

Each hair follicle in our body corresponds to a hair.Within the follicle, cells are formed that form the new hair from the root.

Little by little, while new cells are generated they accumulate outside the foliole , they go outside, die and become what we know as hairs.

«Now I produce cells and now I don't»

Depending on where a follicle is located in our body will produce cells for a period or not .The temporary space in which if they occur is called « growth phase »and the remaining one« resting phase «.After the latter, returns to the growth phase again.

Why does the hair on the head grow and the hair on the arms stays short?

During the resting phase the hair shaft is broken and it ends up falling, so that it allows new hair to grow.We understand that the long that reaches the hair during the phase of growth will be the maximum that I can reach.

Therefore, the follicles of the arms...

The hair of our arms is programmed to stop its growth phase every 2 months , approximately, and that's why they always keep short.

Why does the hair on the head grow and the hair on the arms stays short?

However, hair is programmed to grow for years , which is why it becomes so long Lucky that they have this resting phase, but how long would it take to comb our hair?

Did you know this information?

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