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Questions and Answers
What is the function of the Z-disc in the sarcomere?
What is the function of the Z-disc in the sarcomere?
- Stabilize and align the myosin filaments
- Anchor the myosin filaments to the center of the sarcomere
- Serve as the attachment point for the thin actin filaments (correct)
- Span from the Z-disc to the M-line, providing structural support
Where is the H-zone located within the sarcomere?
Where is the H-zone located within the sarcomere?
- At the M-line
- At the center of the A-band (correct)
- Within the I-band
- Extending from the Z-disc towards the center of the sarcomere
What is the main component of I-band in a sarcomere?
What is the main component of I-band in a sarcomere?
- Only thin actin filaments (correct)
- Thick myosin filaments
- Protein structure that bisects the sarcomere
- Both overlapping actin and myosin filaments
What provides structural support and elasticity to the sarcomere?
What provides structural support and elasticity to the sarcomere?
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What defines the boundaries of a sarcomere?
What defines the boundaries of a sarcomere?
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Where are myosin filaments located within a sarcomere?
Where are myosin filaments located within a sarcomere?
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What is a characteristic of A-Band in a sarcomere?
What is a characteristic of A-Band in a sarcomere?
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What is a function of M-Line in a sarcomere?
What is a function of M-Line in a sarcomere?
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Study Notes
Sarcomere Structure
- The Z-disc anchors the actin filaments and acts as a site for muscle protein assembly and signaling.
- The H-zone is the region of the sarcomere where the myosin filaments are not overlapped by actin filaments.
Sarcomere Components
- The I-band is primarily composed of actin filaments.
- Titin, a protein, provides structural support and elasticity to the sarcomere.
Sarcomere Boundaries
- The Z-discs define the boundaries of a sarcomere.
Myosin Filaments
- Myosin filaments are located in the A-band region of the sarcomere.
A-Band Characteristics
- The A-band is characterized by the presence of myosin filaments.
M-Line Function
- The M-line acts as a site for myosin filament binding and helps to organize the myosin filaments.
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