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What is the role of tropomyosin in muscle contraction?
  • a)
    To release troponin from tropomyosin, allowing myosin to bind to the actin filament
  • b)
    To release calcium from the sarcoplasmic reticulum
  • c)
    To prevent myosin from continuing to slide up the actin filament
  • d)
    To aid in myosin ‘cocking’ on the actin filament
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
What is the role of tropomyosin in muscle contraction?a)To release tro...
Tropomyosin is a protein that plays a regulatory role in muscle contraction. It is positioned along the actin filament in a relaxed muscle fiber, covering the myosin-binding sites on the actin filament. This prevents the myosin heads from binding to actin and inhibits muscle contraction. When calcium ions bind to troponin, a complex associated with tropomyosin, it causes a conformational change in the troponin-tropomyosin complex, uncovering the myosin-binding sites on the actin filament. This allows myosin heads to bind to actin, leading to muscle contraction. Therefore, the primary role of tropomyosin is to regulate the interaction between myosin and actin by blocking or exposing the binding sites on the actin filament.
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What is the role of tropomyosin in muscle contraction?a)To release troponin from tropomyosin, allowing myosin to bind to the actin filamentb)To release calcium from the sarcoplasmic reticulumc)To prevent myosin from continuing to slide up the actin filamentd)To aid in myosin ‘cocking’ on the actin filamentCorrect answer is option 'C'. Can you explain this answer? for MCAT 2025 is part of MCAT preparation. The Question and answers have been prepared according to the MCAT exam syllabus. Information about What is the role of tropomyosin in muscle contraction?a)To release troponin from tropomyosin, allowing myosin to bind to the actin filamentb)To release calcium from the sarcoplasmic reticulumc)To prevent myosin from continuing to slide up the actin filamentd)To aid in myosin ‘cocking’ on the actin filamentCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for MCAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the role of tropomyosin in muscle contraction?a)To release troponin from tropomyosin, allowing myosin to bind to the actin filamentb)To release calcium from the sarcoplasmic reticulumc)To prevent myosin from continuing to slide up the actin filamentd)To aid in myosin ‘cocking’ on the actin filamentCorrect answer is option 'C'. Can you explain this answer?.
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