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Skeletal system
Identify functions of the skeleton
Explain the role that joints play
Describe the characteristics of bone
Skeleton
 Made up of all the bones in your body
 Your skeleton is your framework
Bellwork 9/13/10
 What is your skeletal system?
 What is the function of your skeletal
system?
 What are the organs of your skeletal
system?
Skeletal system
 What does it do?
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Provides shape and support
Enables us to move
Protects our organs
Produces blood cells
Stores minerals and other materials
Shape and support
 Skeleton-determines the shape of your
body
 Backbone-the center of the skeleton
 Vertebrae-small bones of the back
Movement and protection
 Your skeleton allows you to move
 Most of the bones are associated with muscle
 The muscle pull on the bones to make the body
move
 Bones also protect organs
 Skull protects your brain
Production/storage
 Some bones produce substances that
your body needs (blood cells)
 Bones also store minerals (calcium)
Joints
 A joint is a place in the body where two
bones come together
 Joints allow bones to move in different
ways
 Two kinds of joints
 Immovable
 Movable
Immovable joints
 Connect bones in a way that allows little or
no movement
 Example is the bones of the skull
Movable joints
 Most are movable
 Ligaments are connective tissue that hold
the bones in movable joints
 Joints may also have cartilage which is
more flexible than bones
Activity
 Perform these activities and determine
which type of joints is involved
 Move your arm in a circle
 Push open a door
 Lift a book from a desk
 Kneel down
 Wave your hand
 Twist your head from side to side
Joints are on page 14
Bones
 Bones are complex living structures that
undergo growth and development
 Bones are strong and living
Bone structure
 Compact bone- beneath the bone’s outer
membrane
 Spongy bone- inside of the compact bone,
has many small spaces within it
 Marrow- soft connective tissue, found in
the spaces of bone
 Red marrow-produces blood cells
 Yellow marrow-stores fat
Bone strength
 Structure of bone makes it strong and
lightweight.
 Stronger than rocks and concrete
Bone growth
 ITS ALIVE!
 Bones are alive with cells and tissue
 Bones form new tissue as you grow
Bone development
 Move the tip of your nose from side to side
with your finger
 Contains cartilage
 Over time most of the cartilage is replaced
with hard bone tissue
 Is complete by the end of growth
 Many joints always contain cartilage
Bone care
 Balanced diet
 Regular exercise
Diet
 Eat a well balanced diet to promote
healthy bones
 Be sure and get plenty of calcium and
phosphorus
 Where does calcium and phosphorus
come from in our diet?
Exercise
 Builds and maintains strong bones
 Running, skating, dancing
Osteoporosis
 People become old their bones begin to
lose some minerals
 Mineral loss leads to osteoporosis in which
the body’s bones become weak and break
easily
 Regular exercise can prevent it along with
a good diet
 More common in women
Skeletal system
Identify functions of the skeleton
Explain the role that joints play
Describe the characteristics of bone