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Z line

A Dictionary of Biology | 2004 | 331 words | Copyright

Z line (Z band) The thin membrane that separates adjacent sarcomeres in the fibres of striated muscle. It is visible under an electron microscope as a thin dark line in the middle of a lighter band. The centre point of each thin (actin) filament is anchored to the Z line and exerts a pull on the membrane when the fibre contracts.

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