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Transcript

  • 1. Muscles
  • 2. Functions of the Muscular System
    • All movements of the body
    • Move blood through the circulatory system
    • Move food through the digestive system
    • Control the movement of air in and out of the lungs
  • 3. Types of Muscle Tissue 3 types
  • 4. Cardiac Muscle
    • orchestrate the sequence of cardiac muscle contraction
    • Where is it found???
      • Only the Heart
    • Involuntary
  • 5. Smooth Muscle
    • Close pores
    • Move hairs
    • Constricts vessels
    • Moves the contents of the digestive system and circulatory system
      • Rhythmic contractions
    • Involuntary
  • 6. Skeletal Muscle
    • Moves bones at the joints
    • Constricts cavities
    • Moves the skin
  • 7. What is Skeletal Muscle
    • Long, striated and multi-nucleated
    • Attaches to bone or other muscle at the tendinous ends
    • between bony attachments, it crosses 1 or more joints, moving them
    • muscle ALWAYS PULLS
  • 8. Role of Muscle
  • 9. Agonist
    • Moves a body segment in the intended direction
      • causes a movement
  • 10. Antagonist
    • Muscle generating torque opposing that generated by the agonists, acts in the opposite direction
  • 11.  
  • 12. Examples
    • Bicep Curl
    • Bench Press
    • Squat
    • Basketball Chest pass
  • 13. Muscle Contractions 3 Types
  • 14. Concentric
    • Muscle shortens
    • Joint Moves
    • Shortens through its optimal length
  • 15. Eccentric
    • Muscle lengthens
    • “ negative contraction”
    • Greater increase in strength but very dangerous because of to much protein breakdown
  • 16. Isometric
    • opposing torque at the joint is equal to the torque produced by the muscle therefore muscle length remains unchanged
    • No movement at the joint
  • 17. Muscle actions
    • Static (Isometric)
      • Large increase in muscle force
      • BUT –
      • Specific to joint angle
    • Dynamic
      • Concentric and Eccentric
      • Most people build muscle through both movements
  • 18. Golgi Tendon Organ
    • Sensory receptor that inhibits tension development in a muscle and initiates tension development in the antagonist muscles
    • KEY: sense tension
      • stimulated by the presence of active tension in a muscle
  • 19. Golgi Tendon Organ
    • Location: in the junctions between muscles and their tendons
  • 20. Golgi Tendon Organ
    • Action: inhibits muscle tension in the muscle generating too much force and initiates development of muscle tension in the antagonist muscle (excites)
  • 21. Muscle Fiber Types Fast twitch Vs. Slow twitch
  • 22. Type 1
    • Slow twitch
    • Slow to contract
    • slow to fatigue
    • lowest exercise intensity
    • Energy source: muscle glycogen, triglycerides, oxygen
  • 23. Type 2 a
    • Fast to contract
    • Intermediate fatigue rate
    • Higher exercise intensity
    • Energy source muscle glycogen
  • 24. Type 2 b
    • Fastest to contract
    • Fast fatigue rate
    • Highest exercise intensity
    • Energy source ATP-CP
  • 25. FT : Fast twitch ST: Slow twitch
  • 26.