troponin
noun
tro·po·nin ˈtrō-pə-nən 
ˈträ-,
-ˌnin
: a protein of muscle that together with tropomyosin forms a regulatory protein complex controlling the interaction of actin and myosin and that when combined with calcium ions permits muscular contraction
Example Sentences
Recent Examples on the Web According to the International Federation of Clinical Chemistry and Laboratory Medicine, one key characteristic of a hs-cTn assay is the ability to detect troponin in ≥50% of healthy individuals7. 
Christos Varounis, Scientific American, 3 Nov. 2021 Yet there was some drama earlier this week after a pre-draft physical revealed unusually high troponin levels in Paye's blood, according to NFL.com's Ian Rapoport. Orion Sang, Detroit Free Press, 30 Apr. 2021 Fifth, dose-response gradient, as higher troponin levels are associated with higher CV risk. Christos Varounis, Scientific American, 3 Nov. 2021 The blood test Erickson recommends measures troponin proteins, which are normally found in the heart muscle but released into the bloodstream when the heart is injured. Stephanie Innes, USA TODAY, 22 Sep. 2020 Several studies have now shown that roughly 10 to 30 percent of hospitalized COVID-19 patients had high levels of troponin—a protein released into the blood when the heart’s muscle cells are damaged. Ed Yong, The Atlantic, 21 Sep. 2020 Ideally, such athletes should undergo cardiac imaging, plus a blood test for troponin -- which may indicate heart-muscle damage -- to rule out ongoing myocardial damage that would predispose the heart to additional strain, Jennings said. Jason Gale, Bloomberg.com, 8 Sep. 2020 See More
Christos Varounis, Scientific American, 3 Nov. 2021 Yet there was some drama earlier this week after a pre-draft physical revealed unusually high troponin levels in Paye's blood, according to NFL.com's Ian Rapoport. Orion Sang, Detroit Free Press, 30 Apr. 2021 Fifth, dose-response gradient, as higher troponin levels are associated with higher CV risk. Christos Varounis, Scientific American, 3 Nov. 2021 The blood test Erickson recommends measures troponin proteins, which are normally found in the heart muscle but released into the bloodstream when the heart is injured. Stephanie Innes, USA TODAY, 22 Sep. 2020 Several studies have now shown that roughly 10 to 30 percent of hospitalized COVID-19 patients had high levels of troponin—a protein released into the blood when the heart’s muscle cells are damaged. Ed Yong, The Atlantic, 21 Sep. 2020 Ideally, such athletes should undergo cardiac imaging, plus a blood test for troponin -- which may indicate heart-muscle damage -- to rule out ongoing myocardial damage that would predispose the heart to additional strain, Jennings said. Jason Gale, Bloomberg.com, 8 Sep. 2020 See More Word History
Etymology
by shortening & alteration from tropomyosin
Note: The name was apparently first used in print in a letter by the Japanese biochemist Setsuro Ebashi (1922-2006) and coworker Ayako Kodama, "Interaction of Troponin with F-Actin in the Presence of Tropomyosin," Journal of Biochemistry (Japanese Biochemical Society), vol. 59, issue 4 (April, 1966), p. 425.
First Known Use
1966, in the meaning defined above
Medical Definition
troponin
noun
tro·po·nin ˈtrōp-ə-nən ˈträp-
ˈträp- -ˌnin
: a protein of muscle that together with tropomyosin forms a regulatory protein complex controlling the interaction of actin and myosin and that when combined with calcium ions permits muscular contraction