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The sarcomere itself will become shorter.The sarcomere will shorten.
None actually shorten. The thin and thick filaments that compose sarcomeres do not shorten; instead, they slide past one another, causing the sarcomere to shorten while the filaments remain the same length.
Sarcomere
Muscle
Sarcomere
sarcomere
Sarcomere
Sarcomere
The sarcomere is the contractile unit of a muscle fiber.
muscle fibre
sarcomeres
Sarcomere