[ troh-puh-nin, trop-uh- ]

  1. a protein of muscle tissue that binds calcium ions and is involved in contraction.

Origin of troponin

1965–70; tropo(myosin) (see tropo-, myosin) + -n- (of uncertain origin) + -in2

Words Nearby troponin Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use troponin in a sentence

  • The doctors asked Fanone if he’d ever had heart problems, because his body was flooded with troponin, a chemical indicating cardiac distress.

    What Mike Fanone Can't Forget | Molly Ball | August 5, 2021 | Time

Scientific definitions for troponin


[ trōpə-nĭn, trŏpə- ]

  1. One of the proteins that make up the thin filaments of muscle tissue and that regulate muscle contraction and relaxation. Troponin occurs in three forms bound together in a complex. One of the three forms is a receptor of calcium ions that induces structural changes that allow the actin in the thin filaments to interact with myosin, causing contraction.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.