DO NOW
Brainstorm the types of problems your body would
have if it lacked bones?
Hint: There is more than one answer
THE SKELETAL
SYSTEM
Mr. Pezzuto
7th Grade Life Science
Susan B. Anthony Middle School
Objectives
- Students will be able to list the five functions of
the skeletal system
- Students will be able to identify the three types of
joints
- Students will be able to discuss the mechanics of
freely moveable joints.
- Students will be able to give examples of freely
moveable joints
Functions
Primary function:
To support and protect the body
Other functions include:
Mineral Storage
Blood Cell Creation
Mobility
Support
- the skeleton provides structure, support, and shape
for the body.
- Without bones, we would be a blobby mess
- “Coat Rack”
Support
- the skeleton provides structure, support, and shape
for the body.
- Without bones, we would be a blobby mess
“COAT RACK”
Protection
- The Skeletal System also protects internal organs
that are required for life.
Can anyone give me an
example of how the skeleton
protects a vital organ?
Protection
- The Skeletal System also protects internal organs
that are required for life.
- The rib cage protects the heart and lungs
- The Cranium protects the brain
- The Vertebrae protect the Spinal Cord
Movement
Skeletal Muscles pull on bones to make your body
move.
Skeletal muscles are voluntary muscles, meaning you
can control them.
Storage
Bones can store minerals
The minerals work to help nerves and muscles
function properly
DO NOW
List the 5 functions of the skeletal
system
What is a joint?
Give an example of three places in your
body where there is a joint.
Describe 4 different movements your
body can make?
How do you think these movements
are possible?
Joints
Joints are a place where two bones meet
There are 3 types of joints
Immovable Joints: allow no movement. Held
together with either connective tissue or are fused
Slightly Movable Joints: Small amount of
restrictive movement.
Freely Movable Joints: allow movement in
one or more directions
Types of Freely
Movable Joints
Hinge
Saddle
Ball
and
SocketPivot
Hinge Joints
-Hinge joints move like a
hinge. They provide
movement up or down 90
degrees.
-An example of a hinge joint
is your elbow or knee
Saddle Joints
- Saddle Joints permit one
bone to slide in two
directions.
-An example is in your
hands and feet
Ball and Socket
Joints
-Ball and socket joints permit
movement in many
directions. Provides the most
movement of any joints.
-Examples are in your
shoulders and hips
Pivot Joints
-Pivot joints allow one
bone to rotate around
another.
-An Example is in your
arms