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