15. Sliding Filament Theory & Contraction Changes

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10 Terms

1
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What theory explains muscle contraction via filament sliding?

Sliding filament theory

2
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What sliding action occurs between actin and myosin during contraction?

Slide past each other

3
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What mechanical change happens to sarcomeres during contraction?

Shortens

4
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What gross anatomical effect results from sarcomere shortening?

Shortens entire muscle

5
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What are the five structural changes of a sarcomere during contraction?

  1. Z discs approach, 2. Overlap enlarges, 3. H zone disappears, 4. I bands shorten, 5. A band constant
6
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What happens to the distance between Z discs during contraction?

Come together

7
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What happens to the size of the zone of overlap during contraction?

Gets larger

8
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What happens to the H zone during contraction?

Shortens or disappears

9
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What happens to the length of the I bands during contraction?

Shorten

10
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What happens to the length of the A band during contraction?

No change