Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-fact-Medium-Class 11
What is the primary reason for the relaxation of muscle fibers after contraction?
A
Ca ++ ions are pumped back to the sarcoplasmic cisternae.
B
Myoglobin stores excess oxygen for muscle use.
C
Lactic acid accumulation stimulates muscle contraction.
D
Actin filaments bind to myosin during relaxation.
Correct Answer
Option A
Detailed Explanation
Muscle relaxation occurs when Ca ++ ions are pumped back to the sarcoplasmic cisternae, leading to the masking of actin filaments and the return of 'Z' lines to their original position.
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