Foetal ejection reflex in human female is induced by

Options

A. Pressure exerted by amniotic fluid
B. Release of oxytocin from pituitary
C. Full developed foetus and placenta
D. Differentiation of mammary glands

Answer

To solve the question regarding what induces the fetal ejection reflex in human females, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Fetal Ejection Reflex**:
- The fetal ejection reflex, also known as the parturition reflex, is a physiological response that occurs towards the end of the gestation period in humans.

**Hint**: Remember that this reflex is related to childbirth and occurs at the end of pregnancy.

2. **Signals from the Fetus and Placenta**:
- The initiation of this reflex is triggered by signals from the fully developed fetus and the placenta. As the fetus grows and develops, it sends signals indicating readiness for birth.

**Hint**: Focus on the role of the fetus and placenta in signaling the body for labor.

3. **Activation of the Maternal Pituitary**:
- These signals travel to the posterior pituitary gland in the mother, stimulating it to release the hormone oxytocin.

**Hint**: Oxytocin is crucial for the process; think of it as the hormone that triggers contractions.

4. **Role of Oxytocin**:
- Oxytocin is often referred to as the "birth hormone" because it causes the myometrium (the muscular layer of the uterus) to contract. These contractions help in the process of labor.

**Hint**: Remember that oxytocin is responsible for uterine contractions during childbirth.

5. **Positive Feedback Loop**:
- As the myometrium contracts, it further stimulates the release of more oxytocin from the posterior pituitary, creating a positive feedback loop that intensifies contractions until the fetus is expelled.

**Hint**: Positive feedback means that the process amplifies itself; contractions lead to more contractions.

6. **Conclusion**:
- The fetal ejection reflex is ultimately induced by the signals from the fully developed fetus and placenta, leading to the release of oxytocin from the posterior pituitary and subsequent uterine contractions.

**Hint**: The correct answer to the question is related to the signals from the fetus and placenta, not just the hormone itself.

### Final Answer:
The fetal ejection reflex in human females is induced by signals from the fully developed fetus and the placenta.