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Skeletal System
By Desiree Sanchez

2. What do Your Bones Do? One of the two basic functions of your
bones are to provide structure for your
body, without your bones you would be a
big blob incapable of moving. Another
thing they do is produce new cells to
replenish the ones that die everyday. The
middle, inside, of your bones perform this
job. That jelly like middle of your bones is
called bone marrow
Bones like your cranium and rib cage
protect important organs in your body.
The cranium protects your brain. Your
rib cage protects your heart, lungs,
and other internal organs. On the
other hand, your backbone provides
structure which enables you to stand
erect instead of lying like a puddle
on the floor.

3. The Bone Zone When you were born, you were born with over 300 bones.
As you grow older an average adult only has 206 bones. This
is because most of the bones you had when you were a baby
were in your skull. The bones in your skull fuse together as you
get older. When you see “soft spots” on the top of a baby’s head
just remember that those soft spots were created by the bones in
the skull that were not yet fused together.
A typical bone has an outer layer of hard or
compact bone, which is very strong, dense
and tough. Inside this is a layer of spongy
bone, which is like honeycomb, lighter and
slightly flexible. In the middle of some bones
is jelly-like bone marrow, where new cells are
constantly being produced for the blood.

4. How does the Skeletal System Work with Other System?
The Skeletal System protects the organs of the Respiratory System
Bone Marrow produces new red blood cells for the circulatory system.
The bones and muscles work together to move. They are connected by tendons.
The skull *cranium* protects your brain which is part of your nervous system.

5. FUN FACTS
Our bones are 6 times stronger than steel if both are the same weight
The size of the smallest bone is equivalent to the size of a rice grain.
Both Humans and giraffes have the same
amount of bones on their necks, just that
the giraffes have a much longer vertebra.
The only jointless bone in your body is the hyoid bone in your throat.
Of the 206 bones in the skeletal system, 52 of them make both our feet.