EVIDENCE

• EVIDENCE FOR THE SLIDING FILAMENT MECHANISM?


  if the SFM is correct, there will be a greater overlap (darker) of actin and myosin in a contracted muscle than a relaxed muscle
• HOW DOES THE SACROMERE CHANGE WHEN A MUSCLE CONTRACTS?


  • I-band becomes narrower
  • Z-lines move closer together (sarcomere shortens)
  • H-zone becomes narrower
  • A-band remains same width
• WHAT DO CHANGES IN SARCOMERE DEMONSTRATE?


  muscle contraction is not due to filaments shortening (A-band does not change shape)