NEET Zoology Muscle Contraction Assertion Reason Question
Assertion (A): During muscle contraction, the 'Z' lines come closer together.
Reason (R): Calcium ions are pumped back into the sarcoplasmic reticulum, causing muscle relaxation.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
Correct Answer
Detailed Explanation
The 'Z' lines come closer during muscle contraction due to the sliding of actin and myosin filaments. Calcium ions being pumped back leads to muscle relaxation, not contraction.
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