Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-conceptual-Medium-Class 11
If the concentration of calcium ions in the sarcoplasm suddenly increases, which of the following best describes the immediate effect on muscle contraction?
A
Troponin binds to calcium, exposing myosin binding sites on actin.
B
Tropomyosin is immediately degraded by enzymes.
C
ATP synthesis is directly inhibited by calcium ions.
D
Calcium ions directly convert actin into myosin.
Correct Answer
Option A
Detailed Explanation
According to the NCERT context, an increase in calcium ion concentration allows calcium to bind with troponin, which removes the masking of active sites on actin, facilitating muscle contraction.
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