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…