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Sliding Filament Theory
Terms of the sliding filament theory
7
Anatomy
Undergraduate 2
03/31/2007

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Term
Sliding Filament Theory
Definition
The contraction of a muscle cell occurs as the thin filamentsslide past the thick filaments. During contraction, the sarcomere shortens ans the thin and thick filaments overlap to a greater degree.
Term
The sliding filament theory of how a muscle contracts involves the activities of what 5 different molecule plus...?
Definition
1. Myosin, 2. Actin, 3. Tropomyosin, 4. Troponin, 5. ATP, and Calcium ions
Term
The shape of an individual myosin molecule is similiar to what shape?
Definition
A golf club with two heads
Term
Cross Bridge
Definition
The globular head of the myosin protein that composes the thick filament. Has the ability to flex or move back and forth
Term
Power Stroke
Definition
The flexing movement of the myosin cross bridge that pulls the thin filament inward toward the center of the sarcomere
Term
The "hinge" portion of the linear tail of a myosin molecule allows what to happen?
Definition
Vertical movement of the myosin molecule so that the cross bridge can bind to actin, the thin filament
Term
The myosin cross bridge has two important binding sites:
Definition
One site specifically binds ATP. The second binds to actin, the thin filament
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