muscle formation by fleets_bybe

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muscle formation by fleets_bybe

  1. 1. MUSCLE FORMATION, LOSS, AND MAINTENANCE
  2. 2. Muscle <ul><li>is composed of thousands of muscle fibers, each composed of a single muscle cell. </li></ul><ul><li>a muscle cell contains a series of ultramicroscopic filaments called myofibrils </li></ul><ul><li>Each myofibril is a muscle cell that contains units called sarcomeres. </li></ul>
  3. 3. Sarcomere <ul><li>Contain protein actin and protein myosin that are arranged parallel to one another. </li></ul>
  4. 4. 3 Types of Muscle <ul><li>Skeletal muscles </li></ul><ul><li>- voluntary and striated </li></ul><ul><li>Cardiac muscles </li></ul><ul><li>- involuntary and striated </li></ul><ul><li>Smooth/visceral muscles </li></ul><ul><li>- involuntary and non-striated </li></ul>
  5. 5. Muscle Functions: <ul><li>Movement and stabilization </li></ul><ul><li>Storage and movement of substances within the body </li></ul><ul><li>Generation of heat </li></ul>
  6. 6. Properties of Muscle Tissue: <ul><li>Excitability </li></ul><ul><li>- responds to certain stimuli </li></ul><ul><li>Contractility </li></ul><ul><li>- shortens, generating tensions </li></ul><ul><li>Extensibility </li></ul><ul><li>- can be stretched without damage </li></ul><ul><li>Elasticity </li></ul><ul><li>- returns to original shape after contraction </li></ul>
  7. 7. 2 Types of Muscle Contraction: <ul><li>Isometric contraction </li></ul><ul><li>- the length of the muscles remains constant but the force generated by the muscles is increased </li></ul><ul><li>ex. Pushing against an immovable wall </li></ul><ul><li>Isotonic contraction </li></ul><ul><li>- is characterized by shortening of the muscles with no increase in tension within the muscle ex. Flexing the forearm </li></ul>
  8. 8. Muscle Loss <ul><li>Atrophy </li></ul><ul><li>- decrease in the size of the muscle </li></ul><ul><li>Hypertrophy </li></ul><ul><li>- increase in the size of individual muscle fibers without an increase in their number. </li></ul><ul><li>3. Dystrophy </li></ul><ul><li>- degeneration of skeletal muscle fibers </li></ul>
  9. 9. <ul><li>Exercise is recommended to improve motor skills, fitness, and muscle strength. </li></ul><ul><li>a. Aerobic exercise </li></ul><ul><li>Involves long, low levels of exertion. </li></ul><ul><li>b. Anaerobic exercise </li></ul><ul><li>Short burst of higher intensity contraction. </li></ul>Muscle Maintenance
  10. 10. have a nice day!!!
  11. 11. <ul><li>GROUP 2 </li></ul>

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