How does unblocking a blocked fallopian tube work? What I mean is, just because you open an apparent blockage, is that all you have to do? Do the little "fingers" at the end of the tubes have to do anything to get the eggs to go up into the fallopian tubes? Opening up closed fallopian tubes to me just seems real simplistic - is that all it takes when doctors think the only problem is blocked tubes? How do fallopian tubes get blocked in the first place?