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What is the 'origin' of a muscle?

  1. Moveable attachment to a bone

  2. Detachment of muscle

  3. Fixed attachment to a bone or tissue

  4. Central part of a muscle

The correct answer is: Fixed attachment to a bone or tissue

The origin of a muscle is the part that is attached to a bone or tissue and does not move during contraction. Option A is incorrect because it only describes the function of the origin, not the location. Option B is incorrect because a detachment of a muscle does not refer to its origin. Option D is incorrect because the central part of a muscle is known as the belly or the body, not the origin. Thus, C is the correct answer as it accurately describes the fixed attachment of a muscle to a bone or tissue.