ATP in Muscle Contractions

Kawrae

>> Calculate approximately how many molecules of ATP are required for a standard muscle like the biceps during the contraction phase of a single twitch.

I honestly do not even know where to begin here... I don't think he wants us to go through and just outline Glycolysis/Kreb's Cycle/ETC because that's just producing ATP in general, not for a specific contraction. And that's not saying how much is NEEDED...

I've looked around on the internet but can't really seem to come up with an answer. I know that calcium is needed but again, I can't figure out how much.

Does anyone think they could help me out? Thanks