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Microscopic structure of skeletal muscle cell part 3
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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
ID
141449
Card Set
Microscopic structure of skeletal muscle cell part 3
Description
unit 2
Updated
2012-03-20T21:13:21Z
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