12. During skeletal muscle contraction, multiple crossbridge cycles are occurring between the same thick and thin filament. Which of the following best describes this process? - (A) Crossbridge cycling is highly synchronized between a certain thick and thin filament. - (B) Crossbridge cycling is asynchronous between a certain thick and thin filament. - (C) No more than one myosin head links to the thin filament at the same time. - (D) No more than one myosin head detaches from the thin filament at the same time. - (E) Tropomyosin only exposes one binding site on actin at a time allowing only one crossbridge to form with actin at a given time.