Which of these is not and important component of initiation of parturition in humans?

Options

A. Synthesis of prostaglandins
B. release of oxytocin
C. release of prolactin
D. increase in estrogen and progesterone ratio

Answer

To determine which of the options is not an important component of the initiation of parturition in humans, we can analyze each option provided:

1. **Synthesis of Prostaglandins**:
- Prostaglandins play a crucial role in labor. They help in softening the cervix and initiating contractions. Therefore, this component is important for the initiation of parturition.

2. **Release of Oxytocin**:
- Oxytocin is essential during labor as it stimulates uterine contractions and helps in reducing stress and pain. This hormone is released in response to the stretching of the cervix and is vital for the labor process. Hence, this component is also important.

3. **Release of Prolactin**:
- Prolactin is primarily known for its role in lactation (breastfeeding) and is not directly involved in the initiation of labor. While it does increase during pregnancy and peaks at birth, its primary function is related to milk production rather than the process of parturition itself. Thus, this component is not critical for the initiation of parturition.

4. **Increase in Estrogen and Progesterone Ratio**:
- The ratio of estrogen to progesterone is significant in the context of labor. Research indicates that the ratio decreases as labor approaches, which is important for the initiation of parturition. Therefore, this component is important.

Based on the analysis, the option that is not an important component of the initiation of parturition in humans is:

**Release of Prolactin.**