Muscular System
Mediumbiology
Calcium is important in skeletal muscle contraction because it:
Select the correct option:
Solution
Incorrect! Answer:
Binds to troponin to remove the masking of active sites on actin
- Resting State: Active sites on actin filaments are masked by the protein troponin.
- Role of Calcium: When a nerve impulse reaches the muscle, Ca2+ is released from the sarcoplasmic reticulum.
- Binding and Unmasking: Ca2+ binds to troponin, causing a conformational change that pulls tropomyosin away from the active sites.
- Conclusion: This allows the myosin cross-bridges to bind to actin, initiating contraction.
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About This Question
- Subject
- biology
- Chapter
- locomotion and movement
- Topic
- muscular system
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Binds to troponin to remove the masking of active sites on actin
- Resting State: Active sites on actin filaments are masked by the protein troponin.
- Role of Calcium: When a nerve impulse reaches the muscle, Ca2+ is released from the sarcoplasmic reticulum.
- Binding and Unmasking: Ca2+ binds to troponin, causing a conformational change that pulls tropomyosin away from the active sites.
- Conclusion: This allows the myosin cross-bridges to bind to actin, initiating contraction.
This medium difficulty biology question is from the chapter locomotion and movement, covering the topic of muscular system. It appeared in the 2025 exam.
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