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Assertion. The extensor muscles of the human back remain in sustained contraction to maintain erect posture against gravity. Reason. The extensor muscles are rich in red muscle fibres with abundant mitochondria and myoglobin.A. If both A and R are true and R is the correct explanation of A .B. If both A and R are true but R is not the correct explanation of A.C. If A is true but R is false.D. If both A and R are false. |
| Answer» Correct Answer - A | |