Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-fact-Easy-Class 11
What is the role of calcium ions in muscle contraction?
A
They bind to troponin and expose active sites on actin.
B
They cause the release of acetylcholine at the neuromuscular junction.
C
They directly cause the muscle fibers to shorten.
D
They are responsible for the elasticity of muscle fibers.
Correct Answer
Option A
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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