troponin
(trō′pŏ-nĭn)

An inhibitory protein in muscle fibers. The action potential at the sarcolemma causes the sarcoplasmic reticulum to release calcium ions, which bond to troponin and shift tropomyosin away from the myosin-binding sites of actin, permitting contraction.
SEE: muscle for illus
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Citation
Venes, Donald, editor. "Troponin." Taber's Medical Dictionary, 25th ed., F.A. Davis Company, 2025. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767624/all/troponin_I.
Troponin. In: Venes DD, ed. Taber's Medical Dictionary. F.A. Davis Company; 2025. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767624/all/troponin_I. Accessed April 2, 2025.
Troponin. (2025). In Venes, D. (Ed.), Taber's Medical Dictionary (25th ed.). F.A. Davis Company. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767624/all/troponin_I
Troponin [Internet]. In: Venes DD, editors. Taber's Medical Dictionary. F.A. Davis Company; 2025. [cited 2025 April 02]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767624/all/troponin_I.
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