NEET Zoology Muscle Contraction MCQ Question
What is the role of calcium ions in muscle contraction?
They bind to troponin and expose active sites on actin.
They cause the release of acetylcholine at the neuromuscular junction.
They directly cause the muscle fibers to shorten.
They are responsible for the elasticity of muscle fibers.
Correct Answer
Detailed Explanation
Calcium ions bind to a subunit of troponin on actin filaments, which removes the masking of active sites for myosin, facilitating muscle contraction.
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