Kw-logo-smaller

Dem Bones

The human skull is composed of 30 different bones.
Human Skull
Dem Bones - Reviewed by Kidzworld on Dec 27, 2006
( Rating: 1 Star Rating)

You probably think of death when you think about skeletons. Maybe you think that skeletons are like scaffolding, holding everything in the body in place. The truth is bones are a lot more. They're alive.

You probably think of death when you think about skeletons. Or maybe you think that skeletons are like scaffolding, holding everything in the body in place, and the bones are like metal bars. True but bones are also very much alive. They aren't just some solid material like metal, they are alive with cells. Human bones have three layers. The smooth, hard outer layer is cortical bone. Beneath this layer are many layers of cancellous bone. Cancellous bone looks kinda like a sponge. Although not quite as hard as cortical bone, it's still pretty strong. The third and innermost layer is the bone marrow. Bone marrow is like a thick jelly, and its job is to produce blood cells. So, as you can see, bones aren't only alive, they're responsible for keeping you alive as much as the heart or the brain!

What Do Bones Do?

1Bones make blood cells.

1Bones are the framework for your body.

How Many Bones?

Humans are born with 300 bones, but adults only have 206 bones. So what gives? Some of the 300 original bones in a baby are made of regular bone and some are made of a material called cartilage. Cartilage is soft and flexible to start, but over the years the cartilage grows and slowly hardens into bone. Also, some bones fuse together. All of this is part of the normal growth process.

Some time between the ages of 17 and 21, this growth process ends and your bones are as big as they're going to get. And like magic, you end up with 94 fewer bones than you started with.

Bits of Bones

1More than half of the body's 206 bones are in the hands and feet.

1The skull is composed of 30 different bones.

1The smallest bone in the body is the stirrup bone inside the eardrum. It is less an inch long.

1The largest bone in the body is the femur which is the leg bone that runs from the hip to the top of the kneecap (patella.)

1Everyone's heard of the funny bone, but did you know that humerus is the real name of the long bone that runs from your elbow to your shoulder.

Related Stories:
>
>

readers voted!

Comments

Shadeleaf

Shadeleaf wrote:

The Skull of Truth is what I think about when I hear "Skull" XD
commented: Sat Mar 01, 2014

When 2 worlds collide
spraines
commented: Wed May 01, 2013

jeniya1234

jeniya1234 wrote:

hey yall
commented: Tue Dec 13, 2011

there are 5 more comments

Please login or register to add comments

share with your friends


Twitter Facebook Myspace Digg


like this article?
Sign up now to get more just like!

latest videos

F1089155006921

Who's Sporting the Worst Summer Style?

  • Christina Aguilera! That girl is a walking fashion disaster.
  • Is that a garbage bag Kirsten Dunst is wearing?
  • Fantasia has definitely looked better.
  • They're all sportin' bad summer style.

related stories

Micro_s micro
Having big strong muscles isn’t always the answer to becoming great at your sport. It’s how you u...
Next time the 'rents tell you to eat your carrots, do it! They're chock-full of vitamin A, which ...

Dear Dish-It in the forums

brunostar
"-Allie-" wrote:I hate to break it to you all but parents weren't born into the world as parents. They were young once just like you, and had fun. Scary I know. *screams*
reply 25 minutes
-Allie-
-Allie- posted in Family Issues:
I hate to break it to you all but parents weren't born into the world as parents. They were young once just like you, and had fun. Scary I know.
reply 26 minutes
ChickenGoPowPow
Probably they just wanted to have some fun.  I've never been in a food fight before, but after hearing that.. it's kinda rare. 
reply about 1 hour
ChickenGoPowPow
You can have crushes on people, but you don't have to date them... Hmm, it's just like saying that you have a crush on a famous person, but you all know you can't ask that person out. You just have to listen to your parents. But if the guy still likes you when you're older, then maybe you two can date then. :)
reply about 1 hour
brunostar
theres nothing wrong with a food fight XD
reply about 4 hours

play online games

Candy-100

A great online version of the famous Candy Crush. This is the best game launched...

1515_gl_kidzworld_100x100_jpg_fz

Intriguing planets, weird and wonderful characters; challenge friends and find a...

157262_(2)

When you go back to Candyland, you’ll wonder why you ever left in the first plac...

100x100_ra_logo_girl

Uncle George has left you his farm, but unfortunately it’s in pretty bad shape. ...

_thumb_100x100

Shoot blobs with different properies to merge yellow blobs. Your blobs can be re...