Lesson3 muscle
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Lesson3 muscle






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Lesson3 muscle Lesson3 muscle Presentation Transcript

  • Muscles
  • 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
  • Types of Muscle Tissue 3 types
  • Cardiac Muscle
    • orchestrate the sequence of cardiac muscle contraction
    • Where is it found???
      • Only the Heart
    • Involuntary
  • Smooth Muscle
    • Close pores
    • Move hairs
    • Constricts vessels
    • Moves the contents of the digestive system and circulatory system
      • Rhythmic contractions
    • Involuntary
  • Skeletal Muscle
    • Moves bones at the joints
    • Constricts cavities
    • Moves the skin
  • 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
  • Role of Muscle
  • Agonist
    • Moves a body segment in the intended direction
      • causes a movement
  • Antagonist
    • Muscle generating torque opposing that generated by the agonists, acts in the opposite direction
  • Examples
    • Bicep Curl
    • Bench Press
    • Squat
    • Basketball Chest pass
  • Muscle Contractions 3 Types
  • Concentric
    • Muscle shortens
    • Joint Moves
    • Shortens through its optimal length
  • Eccentric
    • Muscle lengthens
    • “ negative contraction”
    • Greater increase in strength but very dangerous because of to much protein breakdown
  • 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
  • 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
  • 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
  • Golgi Tendon Organ
    • Location: in the junctions between muscles and their tendons
  • 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)
  • Muscle Fiber Types Fast twitch Vs. Slow twitch
  • Type 1
    • Slow twitch
    • Slow to contract
    • slow to fatigue
    • lowest exercise intensity
    • Energy source: muscle glycogen, triglycerides, oxygen
  • Type 2 a
    • Fast to contract
    • Intermediate fatigue rate
    • Higher exercise intensity
    • Energy source muscle glycogen
  • Type 2 b
    • Fastest to contract
    • Fast fatigue rate
    • Highest exercise intensity
    • Energy source ATP-CP
  • FT : Fast twitch ST: Slow twitch