Vetinerary Assistant Practice Exam

What significant effect does oxytocin have during parturition?

1. Inhibits labor

2. Stimulates milk production

3. Increases urine output

4. Stimulates uterine contractions

The correct answer is: Stimulates uterine contractions

Oxytocin plays a crucial role during parturition by stimulating uterine contractions, which are essential for the process of childbirth. As labor begins, the release of oxytocin from the posterior pituitary gland enhances the rhythm and intensity of contractions in the uterus. This increase in contractions helps to facilitate the dilation of the cervix and the eventual delivery of the offspring. The importance of oxytocin in this context lies in its ability to create a feedback loop; stronger contractions lead to greater release of oxytocin, which in turn leads to even stronger contractions. This mechanism is vital for progressing through the stages of labor efficiently and ensuring a successful delivery. Other options do not pertain directly to the primary function of oxytocin during parturition. For instance, while oxytocin can be involved in lactation, its primary significant effect during parturition is related to the contraction of the uterine muscles.