Multiple Choice
What does the sliding filament theory describe?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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Which specific region of the sarcomere contains only thin filaments?
A
I band
B
A band
C
H zone
D
M line
Verified step by step guidance1
Understand the structure of a sarcomere: A sarcomere is the basic contractile unit of muscle fiber, composed of thick and thin filaments arranged in a specific pattern.
Identify the components of the sarcomere: The sarcomere is divided into several regions, including the I band, A band, H zone, and M line.
Define the I band: The I band is the region of the sarcomere that contains only thin filaments (actin) and is lighter in appearance under a microscope.
Differentiate between the regions: The A band contains both thick (myosin) and thin filaments, the H zone is within the A band and contains only thick filaments, and the M line is the center of the A band where thick filaments are anchored.
Conclude that the I band is the specific region of the sarcomere that contains only thin filaments, as it does not overlap with thick filaments.
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