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Sagot :
Correct option b) Cooperativity.
Visualization of troponin on actin filaments (F-actin). Troponin performs a principal position withinside the calcium-law of muscle contraction: Troponin is the only calcium-binding aspect of skinny filaments (actin-tropomyosin-troponin complicated) of striated muscles.
The binding of calcium ions to troponin C triggers vertebrate striated (skeletal or cardiac) muscle contraction via a chain of interactions related to the regulatory proteins which includes tropomyosin and troponin that modify the interplay among actin and myosin. calcium reasons a shift withinside the function of the troponin complicated on actin filaments, which exposes myosin-binding sites .
Myosin sure through ADP and inorganic phosphate (Pi) can then shape cross-bridges with actin, and the discharge of ADP and Pi produces the electricity stroke that drives contraction.
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