THE MUSCULAR SYSTEM <ul><li>Function: locomotion </li></ul><ul><li>  </li></ul><ul><li>Types of muscles in vertebrates </l...
<ul><li>Tendons </li></ul><ul><ul><li>Straps of densely connective tissue attaching muscles to bones </li></ul></ul>
<ul><li>Muscles in movable joints of vertebrates are attached in opposing pairs: </li></ul><ul><ul><li>Flexors and Extenso...
MUSCLE ORGANIZATION
A CLOSER LOOK AT THE MUSCLE FIBER MYOSIN ACTIN Z Line H Zone I Band
THE MYOFIBRIL
Muscular Contraction- THE SLIDING FILAMENT THEORY
<ul><li>Thin filaments slide across the thick filaments to pull the Z lines together and shorten the sarcomere  </li></ul>...
How Muscles Work <ul><li>When myosin filaments contract heads of myosin filaments move first, moving them closer in the di...
 
HUMAN MUSCULAR SYSTEM
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5. muscular system

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5. muscular system

  1. 1. THE MUSCULAR SYSTEM <ul><li>Function: locomotion </li></ul><ul><li>  </li></ul><ul><li>Types of muscles in vertebrates </li></ul><ul><li>  </li></ul><ul><li>Involuntary (Smooth)- associated with viscera; no striations </li></ul><ul><li>Voluntary (striated) skeletal muscles; under conscious control </li></ul><ul><li>Involuntary striated cardiac muscles- found in the heart </li></ul>
  2. 2. <ul><li>Tendons </li></ul><ul><ul><li>Straps of densely connective tissue attaching muscles to bones </li></ul></ul>
  3. 3. <ul><li>Muscles in movable joints of vertebrates are attached in opposing pairs: </li></ul><ul><ul><li>Flexors and Extensors </li></ul></ul>
  4. 4. MUSCLE ORGANIZATION
  5. 5. A CLOSER LOOK AT THE MUSCLE FIBER MYOSIN ACTIN Z Line H Zone I Band
  6. 6. THE MYOFIBRIL
  7. 7. Muscular Contraction- THE SLIDING FILAMENT THEORY
  8. 8. <ul><li>Thin filaments slide across the thick filaments to pull the Z lines together and shorten the sarcomere </li></ul><ul><li>I Bands shorten and H zone disappears </li></ul><ul><li>sarcomeres in myofibril shorten, they are pulled toward the center of the myofibril and the muscle to contract to about half of its resting length </li></ul>
  9. 9. How Muscles Work <ul><li>When myosin filaments contract heads of myosin filaments move first, moving them closer in the direction of the flex. </li></ul><ul><li>Role of Calcium Ions in Contraction </li></ul><ul><ul><li>When muscle is relaxed, attachment sites for myosin heads are physically blocked by tropomyosin. </li></ul></ul><ul><ul><ul><li>In order to contract a muscle, troponin must move tropomyosin. </li></ul></ul></ul><ul><ul><ul><ul><li>Complex regulated calcium ion concentration. </li></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Muscle fibers store Ca++ in sarcoplasmic reticulum. </li></ul></ul></ul></ul></ul>
  10. 11. HUMAN MUSCULAR SYSTEM

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