Multiple Choice
Which of the following regions of the sarcomere contains overlapping thick and thin filaments?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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Which region of a sarcomere contains thin filaments?
A
I band
B
M line
C
H zone
D
A band
Verified step by step guidance1
Understand the structure of a sarcomere, which is the basic contractile unit of muscle fiber, composed of overlapping thick and thin filaments.
Identify the components of a sarcomere: the I band, A band, H zone, and M line. Each of these regions has specific characteristics based on the arrangement of filaments.
The I band is the region that contains only thin filaments (actin) and is lighter in appearance under a microscope.
The A band is the region that contains the entire length of the thick filaments (myosin) and includes areas where thick and thin filaments overlap.
The H zone is the central part of the A band where there are only thick filaments, and the M line is the center of the H zone, where thick filaments are linked together.
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