Questions and Answers
What occurs in Step 1 of the sliding filament theory?
In Step 2, cross bridges form between actin filament and myosin head.
True
What is produced by the myosin head in Step 3?
ATP
In Step 4, the contraction caused by the release of ATP allows the actin filament to slide past the ______.
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What happens in Step 5 of the sliding filament theory?
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What function does troponin serve in Step 6?
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The entire process of muscle contraction consists of ______ steps.
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Study Notes
Sliding Filament Theory: Steps of Muscle Contraction
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Calcium ions released from the sarcoplasmic reticulum initiate muscle contraction but do not cause movement in the myosin head.
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The presence of calcium ions facilitates the formation of cross bridges between the actin filament and myosin head, creating a strong attachment necessary for contraction.
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ATP produced by the myosin head enables it to slide towards the actin filament, resulting in movement and muscle contraction.
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Muscle contraction is characterized by the sliding of actin filaments past the myosin, leading to the shortening of the muscle.
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Excess ATP plays a crucial role in breaking the cross bridges, allowing the myosin head to detach from the actin filament and reset for another contraction cycle.
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Troponin aids in resetting the actin filament to its initial position after contraction. ATP is converted back to ADP through ATPase, causing the myosin head to return to its rest state.
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Description
This quiz explores the six key steps involved in the sliding filament theory of muscle contraction. Each step is crucial for understanding how calcium ions and myosin heads interact to produce movement in muscle fibers. Test your knowledge on this essential physiological process.
