Multiple Choice
The sliding filament theory explains how muscles contract. Which of the following best describes this process?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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Which of the following regions of a sarcomere contain thin filaments?
A
H zone
B
M line
C
I band
D
A band
Verified step by step guidance1
Understand the structure of a sarcomere, which is the basic unit of a muscle fiber responsible for contraction. It is composed of thick and thin filaments arranged in a specific pattern.
Identify the components of a sarcomere: the I band, A band, H zone, and M line. Each of these regions has distinct characteristics based on the presence of thick and thin filaments.
The I band is the region of the sarcomere that contains only thin filaments. It is located on either side of the Z line and does not overlap with thick filaments.
The A band is the region that contains the entire length of thick filaments and overlaps with thin filaments at its edges. It is central to the sarcomere and includes the H zone and M line.
The H zone is a part of the A band where only thick filaments are present, and the M line is the center of the A band where thick filaments are anchored. Neither the H zone nor the M line contains thin filaments.
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