Terms in this set (22)
Z line (disc)
Anchor for thin filaments.
Anchor for thick filaments. (H)
Dark area; extends length of the thick filaments. (D)
Light area; thin myofilaments only (Z disc is center). (C)
Thick myofilaments only (M line is center).
Functional unit of skeletal muscle; Z disc to Z disc; aligned end to end within myofibril.
light band (I- band)
contains thin filaments only. It has a dark Z-line in the center (myofilaments)
Dark band (A-band)
has both thick and thin filaments (myofilaments)
-12- 16 nm in thickness
- each made of 200 Myosin (protein) molecules.
- has a tail and 2 heads
- head contains Actin- binding site to make a cross- bridge with actin on the thin filament
- each head has ATP binding site and enzyme ATPase to break down ATP.
- 5-7nm in thickness
- each made of 3 components (all protein)
What are the 3 components of thin filaments?
Actin, Tropomyosin, Troponin
2 strands of actin are coiled around each other; contain Myosin Binding Site to form cross bridge with myosin heads.
It covers myosin binding sitr of actin in non- contrating muscles.
actually a complex of 3 subunits
binds to actin
binds to tropomyosin
Binds to calcium
what are the 3 categories of muscle protein?
Cantractile , Regulatory, Structural
Myosin and actin
Tropomyosin and Troponin
Dystrophin and Titin