Skeletal System

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Skeletal System

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

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