How Muscles REALLY Work: Sliding Filament Theory

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Why is it about the optimal length of the muscles, and not about the optimal length of sarcomeres? It seems to me that the optimal muscle length in which the muscle can generate its maximum active force and the optimal length of the fibers (sarcomeres) in which the muscle fibers can generate its maximum active force do not quite correlate with each other (due to the fact that the length-tension relationship for the entire muscle also takes into account the tendons, and not just the range of the working sarcomeres of the fibers), isn't that so?