Muscles - Anatomy & Physiology

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BACK TO MUSCULOSKELETAL ANATOMY AND PHYSIOLOGY


Introduction

  • Skeletal muscle includes muscles of:
    • Posture
    • Movement
    • Respiration


  • Two basic types of skeletal myofibre:
    • Type I
      • Grossly red
      • High myoglobin level
      • Slow rate of contraction
      • High oxidative activity
      • Function - postural
    • Type II
      • Grossly white
      • Low myoglobin level
      • Fast rate of contraction
      • High glycolytic activity
      • Function - exercise


  • Each muscle is composed of multiple fascicles
    • Each fascicle is composed of multiple polygonal myofibres

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