Singnals for partiurition originate from

Options

A. Fully developed foetus only
B. Both placents as well as fully developed foetus
C. Oxytocin released from maternal pituitary
D. Placenta only

Answer

### Step-by-Step Solution:

1. **Understanding Parturition**:
- Parturition refers to the process of childbirth, where the baby is delivered from the mother's womb.

2. **Mechanism of Parturition**:
- Parturition is a complex neuroendocrine mechanism that involves various signals leading to childbirth.

3. **Origin of Signals**:
- The signals for parturition originate from two main sources: the fully developed fetus and the placenta.

4. **Role of Uterine Contractions**:
- The signals from the fetus and placenta lead to mild uterine contractions. These contractions are essential for the process of childbirth.

5. **Fetal Ejection Reflex**:
- The mild contractions initiate the fetal ejection reflex, which is a physiological response that enhances uterine contractions, facilitating the expulsion of the baby.

6. **Release of Oxytocin**:
- As the fetal ejection reflex is activated, the maternal pituitary gland releases oxytocin. This hormone acts on the uterine muscles to increase the strength and frequency of contractions.

7. **Expulsion of the Baby**:
- The continuous release of oxytocin and the resulting strong contractions lead to the expulsion of the baby and the placenta through the birth canal (vagina).

8. **Conclusion**:
- The correct answer to the question is that the signals for parturition originate from both the fully developed fetus and the placenta.