Troponin T is a protein found in heart and skeletal muscles that plays a crucial role in muscle contraction. It is part of the troponin complex, which also includes troponin I and troponin C. When muscles are stimulated to contract, troponin T helps regulate the interaction between actin and myosin, the proteins responsible for muscle movement. In medical settings, measuring levels of troponin T in the blood is important for diagnosing heart conditions, particularly myocardial infarction (heart attack). Elevated troponin T levels indicate damage to the heart muscle, helping healthcare professionals assess the severity of the condition and guide treatment decisions.