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21 Cards in this Set
- Front
- Back
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During the contraction of a muscle fiber, the _______ shortens
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sarcomere
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The sliding of muscle filaments is the result of interactions between _______ and actin molecules
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myosinmyosin
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Each myosin contains a _______ region that extends from the filament and forms the cross-bridge with an actin filament
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head
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The head region of myosin contains a binding site for _______ and a binding site for ATP.
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actin
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The head region of myosin contains a binding site for actin and a binding site for _______.
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ATP
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Each myosin contains the enzyme _______ that hydrolyzes ATP.
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ATPase
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Energy from ATP hydrolysis is transferred from ATP to _______ in order to fuel muscle contraction
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myosin
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Energy from ATP hydrolysis is transferred from ATP to myosin in order to fuel muscle _______.
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contraction
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Myosin that has hydrolyzed ATP bound to it is considered to be _______.
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energized
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Energized myosin can bind to _______.
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actin
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The binding of myosin to actin results in a change in the _______ of myosin.
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shape
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The change in shape of myosin results in the sliding of filaments and muscle _______.
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contraction
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When a muscle fiber is not contracting, its binding sites for myosin are blocked by the protein _______.
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tropomyosin
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What is tropomyosin?
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regulatory protein found in thin filaments that is involved in blocking myosin-binding sites
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position of tropomyosin is controlled by the protein _______.
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troponin
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In order for cross-bridges to form between actin and myosin, _______ must be moved away from the myosin-binding sites on actin.
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tropomyosin
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Troponin is bound to _______ and actin in the thin filament
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tropomyosin
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The binding of _______ to troponin changes the shape of the troponin-tropomyosin complex, and opens the myosin-binding site.
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calcium
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The binding of calcium to troponin enables the formation of cross-bridges which leads to muscle _______.
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contraction
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The binding of calcium to _______ enables the formation of cross-bridges which leads to muscle contraction
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troponin
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A skeletal muscle fiber is stimulated to contract when it receives a signal from a _______.
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motor neuron
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