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Glossary of Physiology Terms -
H zone

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H zone

Definition:
The H zone is in the center of the A band where there is no overlap between the thick and the thin filaments. Therefore, in the H zone, the filaments consist only of the thick filament. The H zone becomes smaller as the muscle contracts and the sarcomere shortens. The center of the H zone is at the M line, which is also at the center of the sarcomere.

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




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