Final answer:
The statement that calcium binding to troponin moves tropomyosin to expose myosin binding sites on actin is true, which is key in muscle contraction.
Step-by-step explanation:
A close-up view of actin with calcium bound to troponin and tropomyosin moved showing the myosin binding sites is True. In skeletal muscle contraction, the binding of calcium ions to the troponin complex causes a conformational change in the tropomyosin, exposing the myosin-binding sites on actin filaments. This process is fundamental to muscle contraction, as it allows the myosin heads to form cross-bridges with actin.