Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Which of the following statements about muscle contraction is correct?
A
Actin filaments are masked by troponin in the resting state.
B
Myosin filaments are primarily composed of actin proteins.
C
Relaxation of muscle occurs when calcium ions are released into the sarcoplasm.
D
The presence of myoglobin is higher in white muscle fibers than in red muscle fibers.
Correct Answer
Option A
Detailed Explanation
In the resting state, a subunit of troponin masks the active binding sites for myosin on the actin filaments, which is crucial for muscle contraction. This aligns with the NCERT context stating the role of troponin in muscle fibers.
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