What is the definition of H Band?

H-Band: Refers to the central zone of a sarcomere that looks lighter under a microscope.  This area of the sarcomere is a lighter portion of the A-band where there is no overlap between the thinner filaments (actin), and the thicker filaments (myosin).

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H Band

Related Terms

  • Sarcomere
  • Actin
  • Myosin
  • Muscle contraction
  • A-Band
  • Cross-bridging


  • H zone
  • Bare zone
  • Light zone

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