Key Definitions for Muscles

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Key Definitions for Muscles


Skeletal muscle - the muscle that cause our bodies to move, also called striated muscle.


Myofibril - part of a muscle fibre, contains saraomeres and the contractile protein actin and myosin.


Saccoplasmic reticulum - equivalent to to the endoplasmic reticulum of the cells. It forms a network of channels that spread out over the surface of the myofibrils and acts as a store of calcium irons that when released initiate muscle contraction.


Sarcoplasm - the equivalent of cytoplasm - the liquid interior or a muscle fibre.


A band - the dark band in a myofibril.


I band - the light band in myofibril.


H zone - the lighter region in the


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