What is pictured below??

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What is pictured below??
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Topic for todayHuman Skeleton(is all your
bones which make up your framework for your body)

• Section 21- 1
• Pg. 574-579

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True or False

• The bones in your body right now are dead.

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Answer

• False
• Your bones are alive
• They have cells within them that take in
  nutrients and expand energy

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What is the purpose/function of the skeletal
system?
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Skeletal system function

1. Support and gives you shape
2. Protects
3. Works with nervous and muscle systems in creating
   movement

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• 4. Produce red blood cells
• 5. Minerals, fat, and nutrients are stored here

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General facts about bones

• The shape of the bone will be a clue to what its
  function
• Bones are several layers
• Have a thick covering periosteum
• Compact bone- hard/part of the bone

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• Spongy bone at ends- helps make bones not heavy
• Marrow cavity-where red, white, and bone marrow
  cells made
• Cartilage (thick smooth layer) is at ends usually
• Helps in movement and absorbing shock
• Can wear away

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Did you always have bones??
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Answer

• First all your bones were cartilage
• Osteoblast occurred
• Changed the cartilage into bones
• When born had more than 300 bones, but as an
  adult is less.
• Bones fused together so have less bones.

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Bones meet together

• Joint
• Where 2 or more bones meet
• Have 4 different types

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• Ligament
• Tough band of tissue that holds bones together at
  joints
• (Bones to Bones)
• Several are found at your knee

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What are the different types of joints??
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Joint types

• Fixed
• -little or no movement occurs
• -Located in skull and pelvis bones

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• Ball and Socket
• -Wide range of movement
• -Located in hip and shoulder bones

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• Sliding
• -Wide range of movement
• -Located in wrist and ankle

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• Hinged
• -Flex or extend
• -Located in fingers, knees, and elbows

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Breaks

• Open- bone breaks through skin
• Closed- bone breaks stays in skin
• Simple- one fracture in bone
• Complex- more than 1 fracture in bone
• Stress- hairline fracture

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Ligament Damage

• Tear
• Partial or complete- rip/tear of it
• ACL or MCL
• Sprain
• Over stretch of the ligament

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The End