Page 342 - Color Atlas of Biochemistry
P. 342
Muscle 333
A. Organization of striated muscle
Muscle Tendon
Bundle of muscle fibers
Nucleus
Z Sarcomere Z Z
Muscle fiber
H zone A band I band
Z H Z line
Myofibril
Troponin Actin Tropomyosin
Thin actin filament
NH 3
150 nm
Small subunits
OOC
OOC
Globular head
Thick myosin filament Myosin molecule
NH 3
B. Mechanism of muscle contraction
Thin
Center of the filament
sarcomere
Thick
filament
P
5 Myosin head relaxed 1
A
P P
Actin
Power stroke A
PP P
ATP
Myosin
H O
2
4 2
Contact Myosin head contracted
3
Koolman, Color Atlas of Biochemistry, 2nd edition © 2005 Thieme
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