Sliding Filament Theory Worksheet
Explore the mechanisms of muscle contraction through the sliding filament theory with this comprehensive worksheet for Grade 10 Science.
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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 is the basic contractile unit of a muscle fiber?
Myofibril
Sarcolemma
Sarcomere
Sarcoplasmic Reticulum
2. What happens to the H-zone during muscle contraction according to the sliding filament theory?
It widens
It disappears
It remains unchanged
It shortens, then lengthens
3. The thin filaments are primarily composed of the protein , while the thick filaments are made of .
4. During muscle contraction, the heads bind to the active sites on the filaments, forming cross-bridges.
5. Briefly explain the role of ATP in muscle contraction.
6. Calcium ions are released from the sarcoplasmic reticulum to initiate muscle contraction.
True
False
7. The Z-discs move further apart during muscle contraction.
True
False
Match the term with its description.
8. Actin
a. Thick filament protein
9. Myosin
b. Thin filament protein
10. Tropomyosin
c. Covers active sites on actin
11. Troponin
d. Binds calcium ions
12. Describe the step-by-step process of muscle contraction according to the sliding filament theory, starting from the nerve impulse and ending with muscle relaxation.