Question

Binding Ca2+ to the troponin complex causes ____________ to move

a. troponin
b. actin
c. the myosin binding site
d. tropomyosin

Answer 1

d. tropomyosin

Step-by-step explanation:

Binding Ca2+ to the troponin complex causes the tropomyosin to move.

Tropomyosin is a protein that helps muscle contraction.

Answer 2

Tropomyosin

Step-by-step explanation:

The calcium binding to troponin and induces the muscle contraction. The active binding site gets exposed due to the calcium binding.

The calcium ions then attaches with troponin molecule. This changes the shape of troponin and removes the tropomyosin protein from the binding site. No ATP is available during this process.

Thus, the correct answer is option (d).