Tropomyosin and troponin are called regulatory proteins because they act like a switch to determine when the fiber can contract and when it cannot.
Troponin is a major component of muscle tissue. It is composed of troponin C, troponin I, and troponin T. Troponin interacts with tropomyosin and myosin to create muscle contraction.
The three parts to troponin are troponin C, which binds calcium ions, troponin I, which inhibits the interaction between actin and myosin, and troponin T, which anchors troponin complex to tropomyosin.
0042 used to be reserved for Czechoslovakia, however since 1997 this is no longer used.00420 is Czech Republic00421 is Slovakia00423 is Liechtenstein
The theraputic troponin level is 0.00.
Troponin testing is done to diagnose heart attacks (myocardial infarctions).
The calling code 0042 is not currently assigned to any country. It was previously used by Czechoslovakia before its dissolution in 1993. After that, the country codes for the Czech Republic and Slovakia were assigned as +420 and +421, respectively. If you're seeing the code 0042, it may be an outdated reference or a misinterpretation.
cardiac troponin I tests measure only cardiac troponin; tests for cardiac troponin T may cross-react with troponin found in other muscles and give positive or increased results in the absence of heart damage.
Troponin is a cardiac enzyme that your heart releases under stress.
Actin and myosin
Both troponin T and I are cardiac markers used to diagnose myocardial infarctions.
Emily Jane Austin has written: 'Characterisation of the interaction sites between Troponin T and Troponin C of the Troponin complex from human cardiac muscle'