[Answer] What is troponin?

Answer: a regulatory protein that moves tropomyosin aside & exposes myosin binding sites when Ca+ is released during muscle contraction
What is troponin?

Troponin I – Wikipedia

Troponin or the troponin complex is a complex of three regulatory proteins (troponin C troponin I and troponin T) that are integral to muscle contraction in skeletal muscle and cardiac muscle but not smooth muscle. Measurements of cardiac-specific troponins I and T are extensively used as diagnostic and prognostic indicators in the management of myocardial infarction and acute coronary syndrom…

Troponin or the troponin complex is a complex of three regulatory proteins (troponin C troponin I and troponin T) that are integral to muscle contraction in skeletal muscle and cardiac muscle but not smooth muscle. Measurements of cardiac-specific troponins I and T are extensively used as diagnostic and prognostic indicators in the management of myocardial infarction and acute coronary syndrome. Blood troponin levels may be used as a diagnostic marker for stroke although the sensitivity of this measurement is low.

Troponin is attached to the protein tropomyosin and lies within the groove between actin filaments in muscle tissue. In a relaxed muscle tropomyosin blocks the attachment site for the myosin crossbridge thus preventing contraction. When the muscle cell is stimulated to contract by an action potential calcium channels open in the sarcoplasmic membrane and release calcium into the sarcoplas…

Troponin is attached to the protein tropomyosin and lies within the groove between actin filaments in muscle tissue. In a relaxed muscle tropomyosin blocks the attachment site for the myosin crossbridge thus preventing contraction. When the muscle cell is stimulated to contract by an action potential calcium channels open in the sarcoplasmic membrane and release calcium into the sarcoplasm. Some of this calcium attaches to troponin which causes it to change shape exposing binding sites for myosin (active sites) on the actin filaments . Myosin s binding to actin causes crossbridge formation and contraction of the mus…

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