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diad

n. 1 (context chemistry English) A sequence of two (different) monomers in a polymer 2 (context anatomy English) A structure in the cardiac myocyte

Wikipedia
Diad

The diad is a structure in the cardiac myocyte located at the sarcomere Z-line. It is composed of a single t-tubule paired with a terminal cisterna of the sarcoplasmic reticulum. The diad plays an important role in excitation-contraction coupling by juxtaposing an inlet for the action potential near a source of Ca ions. This way, the wave of depolarization can be coupled to calcium-mediated cardiac muscle contraction via the sliding filament mechanism.

Usage examples of "diad".

And any group larger than three will soon enough degenerate into sub-groups of diads and triads.

And any group larger than three will soon enough degenerate into sub-groups of diads and triads.