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Correct answer: letter D) sarcomere
This is the basic unit of contraction and relaxation within the muscle fiber. The sarcomere is formed by protein filaments (actin and myosin) that slide over each other, generating force and causing muscle contraction.
The Role of Sarcomeres in Muscle Contraction
One of the most important components of muscle fibers is the sarcomere, which is responsible for the contraction and relaxation of muscle fibers and is the fundamental unit of muscle contraction.
The sarcomere is made up of two types of protein filaments: actin and myosin. These two proteins are arranged in an overlapping pattern, with actin forming a thin filament and myosin forming a thick filament. When the sarcomere contracts, the proteins slide over each other, generating force and causing the fibers to shorten and produce a muscle contraction.
This process is known as the sliding filament theory of muscle contraction.
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