Microscopic structure of skeletal muscle cell part 3

Skeletal muscle cell formation
1.) formed by fusion of multiple Myoblast
- 2.) Myoblast bring own organelles + nuclei
- (multinucleated cell)
- 3.) some myoblasts remain myosatellite cells with:
- a.exercise, disease or damage
- b.helps w repair of cell
Every muscle is surrounded by:

Plasma Membrane= sarcolemma
Transverse Tubules:

Sarcolemma invaginations to center
Myofibrils contain organized myofilaments
- a. contractile proteins
- b. actin(thin filaments)
- c. myosin(thick filament)
Muscle cells consists:

Sarcomeres side by side of myofibrils
*note*
- during contraction the entire sacromere has become a A BAND
*note*
- H BAND-myasin
- BAND-expands and contracts
- H&I BAND-shrink
- I BAND-actin

Author

eli

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Microscopic structure of skeletal muscle cell part 3

Description

unit 2

Updated

2012-03-20T21:13:21Z

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