Cardiac troponin is a protein complex found in the cardiac muscle that plays a crucial role in the regulation of muscle contraction. It consists of three subunits: troponin C (TnC), troponin I (TnI), and troponin T (TnT). These subunits work together to modulate the interaction between actin and myosin, the proteins responsible for muscle contraction. Cardiac troponin is essential for the proper functioning of the heart, and its levels in the blood are often used as biomarkers for diagnosing myocardial infarction (heart attack).
