How is muscle contraction regulated by tropomyosin and troponin?

Question

Fill in the blank(s) with the appropriate word(s).

Answer 1

Tropomyosin molecules form a long chain that covers the active sites along the thin filaments. If the active sites are covered, the muscle cannot contract. Troponin is important in holding the tropomyosin strands in place, and must permit the tropomyosin molecule to change position for the contraction to begin.