What occurs during the second stage of labor?

A) The cervix begins to dilate.
B) The cervix becomes effaced.
C) The fetus is "delivered."
D) The uterus begins to contract.
E) The amnion breaks.

Zona Pellucida

The zona pellucida is a glycoprotein layer surrounding the plasma membrane of an oocyte or early-stage embryo, playing a crucial role in fertilization and preventing polyspermy.

Effaced

In medical terms, often relates to the thinning and stretching of the cervix in preparation for childbirth; in a general context, it can mean erased or made less clear.

Cervix

The lower, narrow part of the uterus that connects to the vagina, playing key roles in childbirth and menstrual flow.