1. Bones! Bones! Bones!
MR. PATRICK JAMES CARABUENA

2. Objectives:
 Describe
the skeletal system
 Describe
the two types of skeletal
system
 Enumerate
and explain the functions
of the skeletal system

3. Skeletal System
 Skeletal
system is made up of bones that
keep our body upright. Without bones, you
will have no support at all. You will be like a
rag doll that cannot stand on its own.
 The whole structure of the skeletal system is
called the skeleton. The skeleton is the
hardened framework of the body that
serves to support and protect soft tissues.

4. Types of Skeleton
 Exoskeleton(External)
is a hard body
covering found in some animals like
insects, crabs and shrimps.
 Endoskeleton(Internal) is a skeleton
found inside the body of animals with
backbones(Vertibrates) like dogs,
snakes and humans. It is a framework
embedded within the body, with the
muscle wrapping the skeleton.

5. Importance of Skeletal System
 Framework:
It gives the body its shape and structure.
 Support:
It holds the tissues in their place. Some muscles
are attached to the bones which makes movements
possible. A membrane called the periosteum surrounds
and protect the bone and holds the muscle in place.
 Protection:
Some bones protect internal organs. The
cranium or skull protects the brain. The rib cage
protects the heart and the lungs. Backbone or spinal
column protects the spinal cord. In women, pelvic
girdle protects the uterus.

6. Importance of Skeletal System
 Blood
formation: The production of
blood cells occur inside the long
bones.
 Storage: The bones store or keep
certain minerals. Calcium
compounds like calcium phosphate
and calcium carbonate are stored in
the bones. They make bones
stronger.

7. Did you know about this?
Animals like earthworms and snails do not have
bones, but they have a hydroskeleton. It serves as
support just as your bones support you body. The
hydroskeleton is a core of liquid wrapped in a
sheath. It is like a balloon filled with water. If you
squeeze one end, the force of your squeeze goes
to the other end of the balloon. For instance. When
an earthworm’s muscle contract, the force that the
muscle exert on the hydroskeleton also goes
through the body of the earthworm, making it
move.