"The hormone that increases the flexibility of the pubic symphysis during pregnancy is relaxin."
The relaxin hormone, which is released early in pregnancy, increases the laxity (looseness) of the ligaments surrounding the pelvic, allowing the pelvis to expand during delivery.
It remodels the ligamentous capsule during pregnancy in humans, making the pelvic bones more malleable for birth. Collagenase is activated by it, changing the characteristics of cartilage and tendon. The corpus luteum and the decidua in the human female generate this polypeptide hormone.
Because it stops the body from experiencing contractions that could induce premature birth, the levels are normally at their peak throughout the first trimester of pregnancy.
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