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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Functional unit of muscle:
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The correct answer is  Functional unit of muscle is : sarcomere It is the pa of myofibril present between two succsive z lines. Ref: Guyton and Hall textbook of medical physiology 12th edition, page number:86,87