Multiple Choice
Which area of a sarcomere only contains thick filaments?
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9. Muscle Tissue
Sliding Filament Theory and the Sacromere
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What is found in the A-bands of sarcomeres?
A
Both actin and myosin filaments
B
Only myosin filaments
C
Titin filaments
D
Only actin filaments
Verified step by step guidance1
Understand the structure of a sarcomere: A sarcomere is the basic contractile unit of muscle fiber, composed of repeating sections of actin and myosin filaments.
Identify the regions of a sarcomere: The sarcomere is divided into different bands and zones, including the A-band, I-band, H-zone, and M-line.
Focus on the A-band: The A-band is the dark area of the sarcomere and is characterized by the presence of thick filaments, primarily composed of myosin.
Determine the overlap: Within the A-band, there is an overlap of actin (thin) and myosin (thick) filaments, which is crucial for muscle contraction.
Conclude the composition: Therefore, the A-band contains both actin and myosin filaments, as it includes the region where these filaments overlap.
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