How Your Hair Works

Kids Health presents,
How The Body Works, with Chloe and the Nurb. Chloe, you’ll never guess what
I got for all of the money in our piggy bank. Magic beans for growing hair. Why do you want to grow hair? Ah, no reason. Nurb, hair doesn’t
grow from beans. Chloe, I’m pretty sure it does. Come with me. I’ll show you how hair grows. Why are we in the
middle of a forest? Does hair come from trees? These aren’t trees, Nurb. That’s a strand of hair. We’re in hair. Hair! What is hair doing here? That’s the thing, Nurb. Hair grows almost anywhere. When you think of
hair, you probably think of the hair that
grows on the head, but there’s hair on almost
every part of the body. Weird! You mean weirdly awesome! Some of the hair on the body
is easy to see, like eyebrows. But other hair, like
the hair on the cheek is so fine that it’s
almost invisible. I have hair on my cheek? Why would my body need that? Depending on where hair
is, it has different jobs. The hair on top of my
head keeps my head warm. My eyelashes protect my
eyes from dirt and dust. And your eyebrows– –attract the lady nurbs. And protect your eyes from
sweat dripping down into them. Amazing. But if this hair
stuff is everywhere, where does it come from? It all starts in the skin. So that’s where the
magic beans are planted. No beans, Nurb. Ah, you stupid good
for nothing beans, I curse the day I bought you. Please continue. There are tube
like hair follicles that extend below the
surface of the skin. At the base of each
follicle is the hair bulb, where cells multiply. As hair begins to grow,
it pushes up and out of the follicle, through the
skin, where it can be seen. That’s amazing. Even more amazing is that once
hair is at the skin surface, the cells that make up a strand
of hair aren’t alive anymore. That’s why it doesn’t hurt
when hair is cut with scissors. Dead cells? Why does it look so
pretty and shiny? For that you can thank the
oil glands, which are also called sebaceous glands. Fancy word. The sebaceous glands produce
the oil that makes hair shiny. Sometimes the
sebaceous gland pumps out too much oil and the
person’s hair may look greasy. Greasy? Oh let me touch! Let me touch! Oh no! What have I done to
the beautiful hair? You didn’t do anything Nurb. You may not notice it, but
hair is always falling out and being replaced by new hair. Each hair grows for an average
of about three years, lives for a few months, and
then it falls out. A new hair grows out
of the same follicle, replacing the old one. Of the 100,000 hairs on
a typical person’s head, about 50 to 100 hairs
fall out each day. That’s neat. Why is this one black though? Hair comes in all sorts
of different colors. Hair color comes from
melanin which is a pigment. The lighter someone’s hair
is, the less melanin there is. So someone with blond
hair has less melanin than someone with black hair. Also, people lose the melanin
in their hair as they age. Is that why my grampy, Jebadiah
Nurb, has all white hair? Exactly. Hair also comes in
different textures, like curly, straight, and wavy. And bald, which is beautiful. Oh my goodness! Chloe look! The beans I threw, they worked! It’s a magical, fantastical,
hairy bean stock. Woo hoo hoo! Nurb, it’s hair. It doesn’t need beans to grow. The average hair grows
half an inch per month. And some people
can grow the hair really long, down their
backs, or even longer. Oh yeah? Well, if it doesn’t need
beans to grow why does it look so healthy and magical? It’s not magic, Nurb. Washing hair regularly
helps keep it looking great. Wash it and it looks great. Ha! A likely story. Well, it helps to brush
and comb it regularly too. And eat healthy food. A nutritious diet
keeps your body healthy from the inside out. Well I’ll be Nurb. I guess you’re right. It is a huge, healthy hair. No beans needed. Glad to see you’ve come around. Now let’s climb it
and get a better view. Wow. I can even see my mommy’s house. Yo, Ma! What’s for lunch?


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