객관식
Which region of a sarcomere contains thin filaments?
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9. Muscle Tissue
Sliding Filament Theory and the Sarcomere
객관식
Which of the following best describes the term 'Z line' in the context of the sliding filament theory and the sarcomere?
A
The Z line is the central region of the A band where thick filaments are anchored.
B
The Z line is the area where actin and myosin filaments overlap.
C
The Z line is the boundary between adjacent sarcomeres.
D
The Z line is the region that contains only thick filaments.
검증된 단계별 안내1
Begin by understanding the structure of a sarcomere, which is the basic functional unit of muscle fibers. Sarcomeres are composed of thick and thin filaments arranged in a repeating pattern.
Identify the components of the sarcomere: the thick filaments are primarily composed of myosin, while the thin filaments are primarily composed of actin.
Learn about the Z line, which is a key structural feature of the sarcomere. The Z line is a disc-like structure that marks the boundary between adjacent sarcomeres.
Understand the role of the Z line in the sliding filament theory. During muscle contraction, the actin filaments slide past the myosin filaments, and the Z lines move closer together, shortening the sarcomere.
Recognize that the Z line is not involved in anchoring thick filaments or containing only thick filaments. Instead, it serves as the attachment point for actin filaments and defines the limits of each sarcomere.
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