Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-numerical-Medium-Class 11
During muscle contraction, if the concentration of calcium ions in the sarcoplasm is increased by 2.5 mM, what is the immediate effect on the interaction between actin and myosin?
A
Calcium ions bind to troponin, removing the masking of active sites on actin filaments.
B
Calcium ions bind to myosin, initiating ATP hydrolysis.
C
Calcium ions inhibit the release of acetylcholine at the neuromuscular junction.
D
Calcium ions cause the detachment of myosin heads from actin filaments.
Correct Answer
Option A
Detailed Explanation
Increase in Ca++ level leads to the binding of calcium with a subunit of troponin on actin filaments, removing the masking of active sites for myosin, thus facilitating muscle contraction.
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