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Glossary of Physiology Terms -
A band

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A band

Definition:
The A band is the region of a striated muscle sarcomere that contains myosin thick filaments. In fact, the A band is the entire length of the thick filament of the sarcomere. Its length is approximately 1 μm. The center of the A band is located at the center of the sarcomere (M line).

Related glossary terms/phrases:
H zone
I band
M line
Z disk




Posted: Thursday, January 8, 2015
Last updated: Wednesday, March 12, 2025
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