How does the troponin-tropomyosin complex affect cross-bridge cycling?

Question

How does the troponin-tropomyosin complex affect cross-bridge cycling? (A) When [Ca2+) is low, the troponin-tropomyosin complex blocks actin’s binding site for myosin. When [Ca2+] is high, the complex rolls out of the way, allowing myosin to bind to actin and initiate the cross-bridge cycle. (B) The troponin-tropomyosin complex regenerates ATP for the myosin ATPase. (C) The troponin-tropomyosin complex regulates calcium release from the terminal cisternae. (D) The troponin-tropomyosin complex binds to the myosin head, facilitating contact with the actin filaments

Tardigrade Admin · Accepted Answer

Correct answer is (a) When [Ca2+) is low, the troponin-tropomyosin complex blocks actin’s binding site for myosin. When [Ca2+] is high, the complex rolls out of the way, allowing myosin to bind to actin and initiate the cross-bridge cycle.

Q. How does the troponin-tropomyosin complex affect cross-bridge cycling?

When [ $C a^{2 +}$ ) is low, the troponin-tropomyosin complex blocks actin’s binding site for myosin. When [ $C a^{2 +}$ ] is high, the complex rolls out of the way, allowing myosin to bind to actin and initiate the cross-bridge cycle.

The troponin-tropomyosin complex regenerates ATP for the myosin ATPase.

The troponin-tropomyosin complex regulates calcium release from the terminal cisternae.

The troponin-tropomyosin complex binds to the myosin head, facilitating contact with the actin filaments

Correct answer is (a) When [ $C a^{2 +}$ ) is low, the troponin-tropomyosin complex blocks actin’s binding site for myosin. When [ $C a^{2 +}$ ] is high, the complex rolls out of the way, allowing myosin to bind to actin and initiate the cross-bridge cycle.