During muscle contraction, calcium ions bind to ___________.Multiple Choicemyosin filamentstroponinactin filamentstropomyosin
Question
During muscle contraction, calcium ions bind to ___________.
- myosin filaments
- troponin
- actin filaments
- tropomyosin
Solution
The correct answer is troponin.
During muscle contraction, calcium ions bind to troponin, which is a regulatory protein found in muscle fibers. When calcium binds to troponin, it causes a conformational change that allows tropomyosin to move away from the binding sites on actin filaments. This exposure of the binding sites on actin facilitates the interaction between actin and myosin, leading to muscle contraction. Therefore, the process initiates when calcium ions are released from the sarcoplasmic reticulum, bind to troponin, and trigger the necessary mechanisms for muscle contraction.
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