What is the role of relaxin during pregnancy?

Relaxin plays a crucial role during pregnancy primarily by aiding in the softening of ligaments and the pelvic structures of a woman’s body. This hormone is secreted by the placenta and the corpus luteum and helps to increase the flexibility of the pelvic joints and ligaments. This is essential for accommodating the growing fetus and preparing the body for childbirth. As the body undergoes significant changes during pregnancy, relaxin facilitates the necessary adjustments while simultaneously helping to maintain stability in the joints.

The other options do not accurately reflect the primary role of relaxin. While uterine contractions are important during labor, they are primarily influenced by hormones like oxytocin rather than relaxin. Additionally, relaxin does not play a direct role in increasing blood supply to the fetus, as this is primarily managed by changes in maternal cardiovascular system dynamics. Lastly, the regulation of glucose levels in the mother is primarily handled by insulin and other metabolic processes, not by relaxin. Therefore, the key function of relaxin in softening ligaments is paramount during pregnancy.