Skeletal System
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Skeletal System

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Skeletal System Skeletal System Presentation Transcript

  • The Skeletal and Muscular Systems
  • Structures of the Body
    • cells: the building blocks of life
      • make up your body
      • many types of cells
        • bone cells, muscle cells, blood cells, and nerve cells
    • tissue: cells of the same type working together
      • bone cells make bone tissue/muscle cells make up muscle tissue
    • organs: body parts that do special jobs
      • tissues of different kinds work together in organs
        • bone tissue and other tissue form organs of bones
        • muscle tissue and other tissue form organs of muscles
    • systems: groups of organs working together
      • bones (type of organ) work together to make the skeletal system
      • muscles (type of organ) work together to make the muscular system
  • The Skeletal System
    • your body is made up of many bones
      • bones support your body and give it shape
      • help you move and protect the organs inside your body
      • bones meet at joints
      • some open and close like hinge of a door
        • your knee
      • other joints let a bone move in many directions
        • your shoulder
  • The Muscular System
    • body has 3 types of muscles
      • skeletal muscles
        • move head, arms, legs, fingers, toes
        • can’t push, only pull
        • work in pairs
        • control skeletal muscles by thinking
      • cardiac muscles
        • muscle your heart is made of
        • muscle works without your thinking about it
      • smooth muscles
        • help organs inside your body do their job
        • muscle works without your thinking about it
    • all muscles move parts of your body
        • do this by getting longer and shorter
  • A Closer Look at Muscles
    • striated muscles
      • skeletal muscle with light and dark stripes
        • stripes patterns made by working parts of muscle cell
      • fibers in skeletal muscle can be up to 30 cm (12in) long
      • some muscles have more than 2000 fibers packed together
    • smooth muscle
      • does not have stripes
      • found in walls of organs
        • stomach,intestines, blood vessels, bladder
      • work by squeezing and relaxing slowly and smoothly
      • fibers are shorter than skeletal muscles
    • cardiac muscle
      • stripes but not as many as skeletal (striated)
      • makes up walls of heart
      • squeezes and relaxes without ever stopping
      • never gets tired
  • Summary
    • the body is made up of basic parts called cells
      • cells make up tissues
      • tissues make up organs
      • organs make up systems
    • skeletal and muscular systems work together to help the body move