NEET Zoology Muscle Contraction MCQ Question
What is the primary reason for the relaxation of muscle fibers after contraction?
Ca ++ ions are pumped back to the sarcoplasmic cisternae.
Myoglobin stores excess oxygen for muscle use.
Lactic acid accumulation stimulates muscle contraction.
Actin filaments bind to myosin during relaxation.
Correct Answer
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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