Sliding Filament Theory Worksheet
Grade 12 Biology worksheet covering the Sliding Filament Theory of muscle contraction, including the roles of actin, myosin, and ATP.
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Standards
Topics
Sliding Filament Theory
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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 is the primary protein component of the thick filament in a sarcomere?
Actin
Myosin
Tropomyosin
Troponin
2. What is the role of ATP in muscle contraction?
To bind to troponin, causing a conformational change
To release calcium ions from the sarcoplasmic reticulum
To provide energy for the myosin head to detach from actin and re-cock
To directly shorten the actin filament
3. The functional unit of a muscle fiber is called a .
4. During muscle contraction, the filaments slide past the filaments.
5. Calcium ions bind to , causing a shift in and exposing the myosin-binding sites on actin.
6. The H zone disappears during maximal muscle contraction.
True
False
7. A single muscle fiber can contract independently without nervous stimulation.
True
False
8. Briefly describe the 'power stroke' in the sliding filament theory.
9. Explain the role of calcium ions in initiating muscle contraction.
10. Observe the diagram below showing a cross-section of a muscle fiber. Label the thick and thin filaments.
A:
B: