What triggers the completion of meiosis of secondary oocyte?

What triggers the completion of meiosis of secondary oocyte? Correct Answer Entry of sperm into the egg cell

The secondary oocyte released from the ovary has finished first round of meiosis. The second round of meiosis occurs in ampulla after the egg encounters the sperm. This leads to formation of large ovum and a tiny second polar body.

Related Questions

The division of primary oocyte into the secondary oocyte and first polar body is an example of _______