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muscle formation by fleets_bybe
 

muscle formation by fleets_bybe

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    muscle formation by fleets_bybe muscle formation by fleets_bybe Presentation Transcript

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