What is troponin cardiac biomarker?

Group of proteins in striated muscle fibers, crucial in muscle contraction interacting btw actin and myosin. Three subunits (TnC [binds calcium triggers contraction], TnI [inhibits interaction btw actin and myosin], TnT [anchors troponin complex to tropomyosin and helps positioning troponin on actin filament]) Clinical evidence of AMI includes increased TnC and one of anemia, V.Tach, HF, kidney disease, hypotension, hypoxemia.