Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-fact-Hard-Class 11
What is the role of troponin in muscle contraction?
A
Masks the active binding sites for myosin on actin filaments.
B
Facilitates the binding of calcium ions to actin filaments.
C
Forms the main structure of the thick filaments.
D
Assists in the relaxation of muscle fibers by breaking down ATP.
Correct Answer
Option A
Detailed Explanation
Troponin, located along the tropomyosin on actin filaments, masks the active binding sites for myosin when the muscle is at rest, preventing contraction until calcium ions bind to troponin.
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