Why does the fur of animals stop growing/shed past a certain length but we have to manually cut our own hairs?
In: Biology
Each hair has a genetic time limit.
The life cycle of human head hair is 2-6 years. An individual hair will grow for up to 6 years and then it falls out.
The hair on your arm has a life cycle of a few weeks and then falls out – less time to grow less length!
Same for animals. Pet a cat for 20 minutes. They’ll shed all over you. Your nails lightly scratching will help the dead hairs come out, and allow new ones to come in. Furry animals have hair with very short life cycles.
Pet a humans head and they hopefully won’t shed much at all.
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