NEET Zoology Muscle Contraction MCQ Question
Which of the following statements about muscle contraction is correct?
Calcium ions bind to troponin, exposing myosin binding sites on actin.
The neuromuscular junction is where actin and myosin filaments meet.
Motor units consist of multiple motor neurons and a single muscle fiber.
ATP is not required for muscle contraction to occur.
Correct Answer
Detailed Explanation
Calcium ions released into the sarcoplasm bind to troponin, which then exposes the binding sites on actin for myosin, enabling contraction. This is a critical step in the muscle contraction process as described in the NCERT context.
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