Final answer:
Once the egg is in the fallopian tube, it is moved down toward the uterus by muscular contractions and cilia beating.
Step-by-step explanation:
Once the egg is in the fallopian tube, it is moved down toward the uterus by a combination of muscular contractions and cilia beating. High concentrations of estrogen around the time of ovulation induce contractions of the smooth muscle along the length of the fallopian tube, which results in a coordinated movement that sweeps the egg towards the uterus. The cilia that line the outside and lumen of the fallopian tube beat more strongly in response to the high estrogen concentrations, creating a current that pulls the egg into the interior of the tube. Once inside, the muscular contractions and beating cilia slowly move the egg towards the uterus.