Multiple Choice
Which muscle fiber type has the highest shortening velocity?
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4. Tissues & Histology
Introduction to Muscle Tissue
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Which letter is associated with the light band of a sarcomere and contains only thin filaments?
A
Z disc
B
I band
C
H zone
D
A band
Verified step by step guidance1
Understand the structure of a sarcomere: A sarcomere is the functional unit of a muscle fiber, consisting of repeating segments of thick and thin filaments organized into bands and zones.
Learn the components of a sarcomere: The thick filaments are primarily composed of myosin, while the thin filaments are primarily composed of actin. These filaments overlap in certain regions, creating distinct bands and zones.
Identify the I band: The I band is the light band of the sarcomere and contains only thin filaments (actin). It is located on either side of the Z disc, which marks the boundary between adjacent sarcomeres.
Compare the I band to other regions: The A band contains both thick and thin filaments, the H zone contains only thick filaments, and the Z disc is the structural boundary anchoring the thin filaments.
Conclude that the I band is associated with the light band of the sarcomere and contains only thin filaments, as described in the problem.
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