The sliding filament model

    Cards (6)

    • Actin and myosin filaments are arranged in a way they create dark and light bands along the myofibril
    • The darker band is called the A band it contains both myosin and actin
    • The lighter band is called the I band and it only contains Actin
    • Z lines are used to show a small portion of the myofibril → a sarcomere
    • Cross bridges → myosin filaments that have tiny projections that extend towards the actin
    • During contraction the actin and myosin interlock via the cross bridge and slide over one another so that they myofibril becomes shorter and the length of the muscle decreases
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