Movement

    Cards (16)

    • Musculoskeletal system
      Roles: movement, support, protection
    • Bone
      • Rigid nature supports and protects organs
      • Provides structure for muscles to pull and create movement
    • Movement
      1. Muscles contract
      2. Muscles pull on tendons
      3. Tendons attached to bones
      4. Bones act as levers
    • Antagonistic muscles
      Muscles that work in opposite directions to produce controlled movement
    • Antagonistic muscles in insect leg
      • Extensor tibiae muscle (extends leg)
      • Flexor tibiae muscle (flexes leg)
    • Skeletal muscles work in antagonistic pairs
    • Synovial joints allow certain movements but not others
    • Skeletal muscle fibres
      • Multinucleate
      • Contain specialized endoplasmic reticulum
    • Muscle fibres
      • Contain many myofibrils
    • Myofibril
      Basic rod-like contractile unit within a muscle cell
    • Sarcomere
      Contractile unit of a myofibril
    • Muscle contraction
      Sliding of actin and myosin filaments
    • ATP hydrolysis
      Necessary for filaments to slide
    • Calcium ions, tropomyosin, troponin
      Control muscle contractions
    • Fluorescent calcium indicators and dyes used to study rapid muscle contraction
    • Ashley and Ridgway first studied role of calcium ions in muscle contraction using aequorin
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