What process involves the binding of calcium and troponin to shape shift the tropomyosin, exposing activated sites on the actin filament and causing a subsequent shortening of the muscle fiber?
a. Sliding-filament theory
b. Calcium pump
c. Action potentials
d. Excitation of myosin
Answer: a. sliding-filament theory
The sliding-filament theory involves the binding of calcium and troponin to shape-shift the tropomyosin, exposing activated sites on the actin filament and causing subsequent shortening of the muscle.