Answer:
the Z lines and thick filaments of the myofibrils within the muscle fibers are aligned.
Explanation:
Myofibrils are made up of units that repeat along their length, called sarcomeres.
Every muscle cell contains contractile protein filaments of two types: actin and myosin. These myofilaments (or myofibrils) are distinguished from one another by molecular weight, which is higher in the myosin filament.
With this information, we can conclude that myofibrils are made up of units that repeat along their length, called sarcomeres.
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