Lesson3 muscle

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Lesson3 muscle

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

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