Function and Morphology of Skeletal muscles
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13 Terms
Fiber
a long, cylindrical, multinucleated cell, Structural unit
Myofibril
contractile element, create band pattern
Sarcomere
functional unit of the contractile system of muscle
THIN FILAMENT
Actin (G&F)
Regulatory proteins:
▪ Tropomyosin
▪ Troponin
THICK FILAMENT
Myosin
Myoglobin
Act as an oxygen store, and contains Fe like hemoglobin
Collagen
Major component of endomysium
Nebulin
Holds the actin double filament together to form F actin.
Titin
Assists M protein to anchor the meromyosin in the middle of the sarcomere. Contributes to recoil of muscle relaxation.
THE MOTOR UNIT
These fibers contract simultaneously Force production increase; fineness of movement decrease with the number of cells in the unit
isometric contraction
static contraction
concentric contraction
shortening contraction
eccentric contraction
lengthening contraction
Note 
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