The connection between the heads and the is called -ing. (Sliding Filament theory)

The sliding filament theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement.

Explanation:

ok will do i shall do that now

answer:

i believe the answer is d).

explanation:

i think this is because you are tearing apart the muscle, and then when you eat, the muscle re-heals, making itself even stronger.

edit: i put b) before but i meant to put d). sorry for the incorrect answer.