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Muscle Contractions definitions

컨트롤 버튼이 '내비게이션' 모드로 변경되었습니다.
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  • Actin
    A thin filament protein in muscle fibers that interacts with myosin to enable contraction by sliding past thick filaments.
  • Myosin
    A thick filament protein with two ATPase heads and a coiled tail, responsible for binding and moving actin during contraction.
  • Sarcomere
    The smallest contractile unit within myofibrils, defined by Z lines, where actin and myosin interact for muscle contraction.
  • Myofibril
    A bundle of actin and myosin filaments within muscle fibers, composed of repeating sarcomeres, essential for contraction.
  • A Band
    A dark region in the sarcomere containing the full length of myosin filaments, including areas overlapping with actin.
  • I Band
    A light region in the sarcomere containing only actin filaments, with no overlap of myosin.
  • H Zone
    A lighter region within the A band where myosin filaments are present without overlapping actin.
  • Z Line
    The boundary structure at each end of a sarcomere, anchoring actin filaments and moving closer during contraction.
  • M Line
    A central disc in the sarcomere's middle, stabilizing the arrangement of myosin filaments.
  • Tropomyosin
    A regulatory protein that blocks actin binding sites in relaxed muscle, preventing myosin attachment until shifted.
  • Troponin
    A protein complex on actin filaments that binds calcium, triggering tropomyosin movement to expose binding sites.
  • Cross Bridge
    A structure formed when myosin heads attach to actin, enabling filament overlap and sarcomere shortening.
  • ATP Hydrolysis
    A chemical reaction providing energy for myosin conformational change, allowing tight actin binding during contraction.
  • Calcium
    An ion that binds to troponin, initiating the exposure of actin binding sites for myosin attachment.
  • Relaxed State
    A muscle condition where actin and myosin filaments have minimal overlap, and the sarcomere is at maximum length.