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6 Cards in this Set
- Front
- Back
- 3rd side (hint)
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A-bands |
Dark regions within the sarcomere where thick filaments (H Band) are located MR: remain constant size MC: remain constant size but H Zone become narrower or disappear entirely |
Muscle relax (MR); Muscle contract (MC) |
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I-bands |
Light regions within sarcomere where only thin filaments are present MR: I-bands appear wider as the thin filaments are not overlapping with thick MC: I-bands become narrower as thin filaments are pulled towards the center of sarcomere |
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M-line |
Structure in the center of sarcomere that helps to anchor thick filaments in place MR: M-line remains intact does not undergo significant change MC: M-line remains intact does not undergo significant change |
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Z-disc |
Structures at the ends of sarcomere that anchor thin filaments MR: Z-discs maintain their position and do not move significantly MC: Z-discs moves closer togetheras thin filaments are pulled inward (shortening of sarcomere) |
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H Zone |
A region within the A-band where only thick filaments are present MR: H Zone appears wider MC: H Zone becomes narrower or disappear completely |
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Sliding filament mechanism |
During contraction the process of thick and thin filaments interacting and sliding past each other Myosin heads of thick filaments bind to actin of thin filaments Myosin undergo a series of conformational changes pulling sarcomere to m-line |
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