1) King topper 
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 Ca2+ ions. This way, the wave of dep...
1. The transverse tubule and a cisterna in cardiac muscle fibres. ... Synonym: dyad. ... (05 Mar 2000) ... 
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Type: Term Pronunciation: dī′ad Definitions: 1. The transverse tubule and a terminal cisterna in cardiac muscle fibers. Synonyms: dyad1
Combination of two colors that are two colors apart on the color wheel.