What role does the hormone relaxin play during pregnancy?

The hormone relaxin plays a critical role during pregnancy, particularly in preparing the body for childbirth. It is primarily produced by the ovaries and the placenta. One of the main functions of relaxin is to help soften the ligaments in the pelvis and to widen the birth canal, making it easier for the baby to pass through during delivery. This preparation is essential for facilitating safe and effective labor.

In addition to its effects on the pelvis, relaxin also contributes to the relaxation of the cervix and can impact other tissues throughout the body. This is crucial as the body undergoes significant physical changes to support both the growing fetus and the process of childbirth. Therefore, the correct answer highlights the pivotal role that relaxin plays in ensuring that the pelvis is adequately prepared for the delivery of the baby.