What happens when a skeletal muscle fiber contracts? Sliding filament theory: Observations • The H and I bands of the sarcomere get __________ • The zones of overlap get _____________ • Z lines move ___________ together • The width of A zone ______________
Added by Ronald R.
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This causes the thin filaments to slide towards the center of the sarcomere, which shortens the sarcomere and ultimately the entire muscle fiber. This process is known as the sliding filament theory. Observations of the sliding filament theory include: Show more…
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When a sarcomere contracts and thin filaments move over thick filaments you would expect to see ________. a. the I bands to appear wider b. the I bands to appear smaller c. the H zone to appear wider d. the A band to appear darker
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In muscle fiber in a completely relaxed state: a. sarcomeres are regions between two H zones. b. discs of M line proteins called the A band separate the thick filaments. c. I bands are composed of the same thick filaments seen in the A bands. d. Z lines are adjacent to H zones, which attach thick filaments. e. dark A bands contain overlapping thick and thin filaments with a central thin H zone composed only of thick filaments.
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