microscopic anatomy of the skeletal muscle

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12 Terms

1
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myofibrils

Long, thread-like structures in muscle cells composed of sarcomeres, responsible for muscle contraction.

2
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sarcomeres

the active structures responsible for muscular contraction, made up of various regions

3
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what are sarcomeres made of

  1. z-line,

  2. I-band,

  3. M-Line,

  4. H-Band,

  5. zone of overlap

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z-line

actin filaments anchored

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I-band

actin only

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M-line

myosin anchored

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H-band

myosin only

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zone of overlap

myosin and actin

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how do sarcomeres change during muscle contraction

they become shorter/ the bands are more compressed

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what happens to the zone of overlap during muscle contraction

the zone of overlap is reduced

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sliding filament theory

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