Sliding Filament Theory Worksheet
An 11th-grade science worksheet covering the sliding filament theory of muscle contraction, including the roles of actin, myosin, ATP, and calcium ions.
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Sliding Filament Theory Worksheet
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Read each question carefully and answer to the best of your ability. Refer to your notes and textbook if needed.
1. Which of the following best describes the primary event that initiates muscle contraction according to the sliding filament theory?
Release of ATP from mitochondria
Binding of calcium ions to troponin
Hydrolysis of ATP by myosin
Formation of cross-bridges
2. What is the role of ATP in the detachment of the myosin head from actin?
It causes tropomyosin to move away.
It provides energy for the power stroke.
Its binding to myosin causes detachment.
It pumps calcium ions back into the sarcoplasmic reticulum.
3. The thin filaments are primarily composed of the protein , while the thick filaments are made of .
4. During muscle contraction, the band shortens, but the band remains the same length.
5. Calcium ions bind to , causing a conformational change that moves away from the myosin-binding sites on actin.
6. Describe the 'power stroke' in the sliding filament theory, including the role of ATP hydrolysis.
7. Explain how the absence of ATP can lead to rigor mortis, relating it to the sliding filament theory.
8. The Z-discs move closer together during muscle contraction.
True
False
9. Myosin heads bind to troponin during the cross-bridge formation.
True
False
10. Refer to the diagram above. Label the A-band, I-band, Z-disc, and H-zone on the provided image.
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