Question

___________ is a protein that calcium binds to, causing tropomyosin to move aside, making the myosin binding sites available on the actin filament.

Answer 1

Tropomyosin is a protein that binds to troponin to form a complex. When calcium ions bind to the complex, tropomyosin moves and exposes the myosin binding sites on actin, leading to muscle contraction.

Step-by-step explanation:

Tropomyosin is a protein that binds to troponin to form a complex.

When calcium ions bind to the troponin-tropomyosin complex, tropomyosin moves aside, uncovering the myosin binding sites on the actin filament.

This allows myosin to bind with actin, triggering muscle contraction.