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Skeleton - Contenido educativo
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Believe it or not, there's something a lot like this inside of you and inside of me,
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too.
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It's a skeleton!
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You may have seen skeletons, like the ones they have of dinosaurs in a museum, or maybe
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plastic models of human skeletons, like this.
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Maybe you've even seen dancing skeletons around Halloween!
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But do you know how important, cool, and powerful your skeleton really is?
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Let's get to know your bones, from how they help you move, to the different kinds you
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have and the super-special job they have to do.
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Let's get started!
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One of your skeleton's important jobs is, of course, to hold your body up.
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Your muscles are strong, but they need a frame, something to hold onto.
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Without a skeleton, you'd be all loosey-goosey, and you wouldn't be shaped like you.
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And it goes both ways.
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Without your muscles, your skeleton would just be a pile of bones.
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It's only by squeezing and relaxing your muscles that you're able to move your bones.
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So that silly dancing Halloween skeleton?
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It's just pretend, because it doesn't have muscles.
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So your bones are hard enough to hold the weight of the rest of your body, but they're
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also hard enough to act like a protective shield around your soft, squishy organs.
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Your ribs, for example, are bones that protect your lungs and heart, so that even if you
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get a big, strong bear hug, your insides don't get squeezed, too.
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And speaking of strong, the strongest bone in your body is also the biggest, longest,
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and heaviest bone you have.
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It's the bone that goes from your hip to your knee, called the femur.
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And that bone has to be big and strong, because when you run, jump, walk, or even just stand
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still, a lot of the weight of your body falls on your femurs.
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Now, where do you think your smallest bone might be?
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The very smallest bone you have is actually in your ear!
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This little bone, called the stapes, looks kind of like a stirrup.
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Even in adults, it's only about the size of a grain of rice.
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But this tiny bone has a big job.
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When sounds enter your ear, they make this little bone move back and forth.
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These vibrations are what your ears pick up as sound.
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So without this teeny tiny bone, you wouldn't be able to hear.
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Now, I have a question.
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How many bones do you think we have?
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Well, it kinda depends.
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It sounds crazy, but you have fewer bones now than when you were born.
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Newborn babies have about 300 bones!
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But by the time you're finished growing, you'll only have 206.
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So where did all those extra bones go?
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Nowhere!
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As babies grow, some of their bones grow together, or fuse into one bigger bone.
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For example, your skull.
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Your hard noggin is actually 21 bones that are fused together, plus one bone that's
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always separate — your jaw.
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Your skull starts out as a bunch of separate bones, because that leaves lots of room for
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your brain to get bigger.
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And once you're fully grown, the fused parts make an incredibly strong shield to protect
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your precious brain.
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One final fun fact about your skeleton — your bones are alive!
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Even though we often think of skeletons as not living, like the ones we see in museums
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or models, your bones are full of living cells.
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Some of these cells are what make your bones grow, and repair them if they get hurt.
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And other cells, which are tucked away in the thick, spongy layer deep inside your bones,
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have a very special job.
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They make your blood.
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That's right!
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Most of the stuff that's in your blood is actually made inside your bones.
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It's because your bones are alive that they're able to grow, like they're doing in you
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right now.
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And they won't be done until you're about 25 years old.
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But even then, your bones will still be busy holding you up, helping you hear, and making
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your blood.
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So bones in museums are cool, and Halloween skeletons are fun, don't get me wrong.
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But nothing's more scary-powerful than your own living skeleton and all the great stuff
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it does for you.
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Do you have a question about animals with big bones, small bones, or no bones at all?
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Just let us know by getting help from an adult and leaving a comment below, or emailing us
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at kids at the scishow dot com, and we'll see you next time!
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- Subido por:
- Gema A.
- Licencia:
- Todos los derechos reservados
- Visualizaciones:
- 19
- Fecha:
- 30 de noviembre de 2021 - 17:21
- Visibilidad:
- Público
- Centro:
- CP INF-PRI PIO BAROJA
- Duración:
- 04′ 10″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1280x720 píxeles
- Tamaño:
- 15.09 MBytes
