Signals for parturition originate from

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Parturition:**
- Parturition refers to the process of giving birth. In humans, this typically occurs around the completion of a nine-month gestation period.

2. **Identifying the Source of Signals:**
- The signals that initiate parturition are crucial for the birth process. These signals are not solely from one source but involve multiple components.

3. **Evaluating the Options:**
- The options provided include:
- A) Oxytocin released from the maternal pituitary
- B) Placenta only
- C) Fully developed fetus only
- D) Both placenta and fully developed fetus
- It is important to analyze these options to identify the correct source of signals for parturition.

4. **Correct Answer Identification:**
- The correct answer is option D, which states that the signals for parturition originate from both the fully developed placenta and the fully developed fetus.
- This is because the signals for initiating labor are a result of the interaction between the fetus and the placenta, indicating readiness for birth.

5. **Role of Oxytocin:**
- While oxytocin, which is released from the maternal pituitary gland, plays a significant role in the process of labor, it is released in response to signals from the placenta and the fetus. Thus, it is not the originating signal but rather a response to the signals indicating readiness for parturition.

**Final Answer:**
The signals for parturition originate from both the fully developed placenta and the fully developed fetus (Option D).

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