What structure releases the secondary oocyte during ovulation? what structure releases the secondary oocyte during ovulation? primary follicle zona pellucida graafian follicle secondary follicle antrum?

The correct answer is Graafian follicle.

Graafian follicle or tertiary vesicular follicles is the follicular stage before ovulation. It, therefore, contains a 2N haploid secondary oocyte that has undergone the first meiotic division. This follicle is characterized by a large follicular antrum with eccentrically located oocyte surrounded by the zona pellucida and a layer of several cells known as the corona radiata.