Body Systems II.

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Body Systems II.

• Skeletal system

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What it does

• There are five major functions to the skeletal
  system
• 1. provides shape and support
• 2. enables you to move
• 3. protects your internal organs
• 4. produces your blood cells
• 5. stores certain materials until your body
  needs them

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Your shape

• Determined by skeleton like steel frame
  determines shape of building
• All bones in body are connected to your backbone
  some way
• Skeleton only weighs in at about 20lbs but can
  support all of you!

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Get Movin!

• You can move because your muscles are attached to
  the bones and when they contract and pull on the
  bones, your able to walk, wave your hand etc
• Muscles are attached to bone by ligaments

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Protection and Production

• Your bones protect your organs
• Skull covers brain, ribs protect heart and lungs
• Some bones produce and store important materials
  your body needs
• As a teenager, only the ends of femurs, your
  skull, hip bones and breastbone contain red
  marrow that produces red blood cells
• Bones store minerals like calcium and phosphorus
  that can be released when your body needs them

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Structure and Growth

• Bones grow through ossification. New cells are
  constantly being made until you are an adult to
  help you grow taller and your bones grow
  stronger.
• As an infant the majority of your bones are made
  of cartilage. By the time you are an adult the
  cartilage has been replaced by bone.
• Red Marrow is connective tissue inside your bones
  that makes red blood cells.
• Yellow marrow, stores fat for energy when its
  needed.
• The periosteum is the connective tissue membrane
  that covers the outer layer of the bone except at
  the joints.

1. spongy bone 2. compact bone 3. periosteum 4.
yellow marrow 5. cartilage
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Jointed skeleton

• There are many places in our body where bones
  come together. These are called joints.
• There are 2 locations of immovable joints- where
  your skull has grown together and where your ribs
  attach to your breastbone or sternum
• There are four types of movable joints in the
  body
• Ball and socket - like at your hip and shoulder
• Pivot- where your head attaches to your neck
• Hinge - ex knees and elbows
• Gliding -at your wrist and ankles

• 1. fixed joint 2. pivot joint 3. ball-and-socket
  joint 4. sliding joint 5. hinge joint

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Dem Bones Dem bones

• Use the link below to complete the online HW
  assignment at Mrs. Ryans Website.

http//www.kidport.com/RefLib/Science/HumanBody/Bo
dyBones.htm
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Bone up on the skeleton

• Go to the link below to complete the online
  skeleton activity.
• Print it out to turn in for HW.

• http//www.klbschool.org.uk/interactive/science/sk
  eleton.htm

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What it looks like