Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Noun: mg Your choice? destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle   (Noun: mi) a miniature model of something   (Noun: microcosm) a metric unit of length equal to one billionth of a meter a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)