Final answer:
A Graafian follicle has a large antrum, which is a fluid-filled cavity. During ovulation, the egg moves out of the ovary and is released into the peritoneal cavity, from where it is picked up by the uterine tube.
Step-by-step explanation:
The Graafian follicle, also known as the tertiary or dominant follicle, has a large antrum, a fluid-filled cavity where follicular fluid accumulates. During ovulation, the egg, or oocyte, has moved out of the ovary and is released into the peritoneal cavity. Here, it is swept into the uterine tube (also known as the fallopian tube) by the fimbriae. This action is made possible by the muscle contractions and the beating of cilia in the uterine tube, as well as the high levels of estrogen present around the time of ovulation, which facilitate the movement of the oocyte-granulosa cell complex towards the uterus.