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Answer choices:
A- It provides energy for contraction
B- It stimulates the thick and thin filaments to contract
C- It displaces tropomyosin to expose the binding sites on actin
D- It stops cross-bridge activity
E- It degrades ACh released by sarcoplasmic reticulum
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What is Troponin tropomyosin complex?
Salam. This complex is the main constituent of the thin filament of myofibril. Tropomyosin does mask (tropomaskin) the actin so as to avoid any myosin attachment to actin until some calcium attaches to troponin and unmask the actin from the mask of tropomyosin.
What is Troponin-tropomyosin complex?
Salam. This complex is the main constituent of the thin filament of myofibril. Tropomyosin does mask (tropomaskin) the actin so as to avoid any myosin attachment to actin until some calcium attaches to troponin and unmask the actin from the mask of tropomyosin.
What holds tropomyosin in place at rest?
troponin molecules.
What myofilaments contains troponin and tropomyosin?
cardiac
What blocks the binding sites on actin?
TROPOMYOSIN MOLECULES ( troponin hold the tropomyosin in place)
Are troponin and tropomyosin contractile or regulatory proteins?
contractile
What is considered to be a regulatory protein of the myofilaments?
Tropomyosin and troponin are called regulatory proteins because they act like a switch to determine when the fiber can contract and when it cannot.
What is the molecular composition of troponin?
Troponin is a major component of muscle tissue. It is composed of troponin C, troponin I, and troponin T. Troponin interacts with tropomyosin and myosin to create muscle contraction.
What are the differences between troponin and tropomyosin?
both subunit serve different functions troponin t binds to tropomyosin, interlocking them to form a troponin-tropomyosin complex... TnT or troponin t is increased in a subset of patients with unstable angina, and these may be at higher risk for subsequent cardiac events and is also a cardiac-specific protein released during cell injury such as that following acute myocardial infarction (MI).... while troponin i binds to actin in thin myofilaments to hold the troponin-tropomyosin complex in place and it has also been identified as an early and and specific marker in cardiac disease and it also elevates above the reference range within 6 hours of the onset chest pain then peaks at approximately 12 hrs. and can remain increased for up to 144 hrs. after the onset of any symptoms or, Troponin T is a Strip test whereas Troponin I is a lab test which is more sensitive
When a muscle is at rest the active sites on the actin are blocked by?
TROPOMYOSIN MOLECULES ( troponin hold the tropomyosin in place)
What regulatory proteins can be found on an actin molecule?
Tropomyosin and Troponin
What is the function of the calcium in the sarcoplasm?
Calcium is released from the sarcoplasm to bind with the troponin which allows the tropomyosin the reveal the binding sites on the actin so the muscle can contract
