muscle formation by fleets_bybe
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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