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Assertion : The contraction and relaxation of muscle fiber are controlled by nerve impulses. Reason : The threshold stimulus is the minimum stimulus required for the beginning of contraction.A. If both Assertion and Reason are ture and the Reason is the correct explanation of the Assertion.B. If both Assertion and Reason are ture, but the Reason is not the correct explanation of the Assertion.C. If Asserion is ture, but Reason is false .D. If both Assertion and Reason are false.

Answer» Correct Answer - B


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