That's where the blood leads by, okay, on that side of the heart the left hand side of the heart it's being pumped and therefore the muscle is a bigger muscle, that's doing the contracting, the blood push out and it relaxes back again and that allows the blood to be sucked back down into the heart, okay, and the next time it's shh, that goes out and then it relaxes down again and the blood sucks back down into the heart, okay so that's what it does, all the muscle can do is that, muscle can only retract and then it relaxes, contract and then it relaxes, that's what the heart's doing all the time, how many beats a minute?