How does troponin facilitate cross bridge formation?
a. Troponin moves away from the active sites on actin, permitting cross bridge formation.
b. Troponin gathers excess calcium that might otherwise block actin’s progress.
c. Troponin hydrolyzes ATP, which provides the energy necessary for cross bridges to form.
d. Troponin controls the position of tropomyosin on the thin filament, enabling myosin heads to bind to the active sites on actin.