Calcium ions combine with troponin C allows this result? what answer? a. troponin complex tugs on the tropomyosin molecule deeper into groove bet the two actin strands, thus “uncovers” the active sites of the actin.
b. troponin complex tugs on the tropomyosin molecule deeper into groove bet the two actin strands, thus “covers” the active sites of the actin.
c. troponin complex remain covering  tropomyosin, thus “covers” the active sites of the actin.
d. troponin complex tugs on the other troponin molecule deeper into groove bet the two actin strands, thus “uncovers” the active sites of the actin.