At the end of the gestation period ;Parturition reflex leading to delivery of the baby in human female is induced by:

Options

A. pressure exerted by amniotic fluid
B. release of oxytocin from pituitary
C. fully developed foetus and placenta
D. differentiation of mammary glands

Explanation

**Step-by-Step Solution:**

1. **Understand the Gestation Period**: The gestation period in humans lasts approximately 9 months, or about 36 to 40 weeks. At the end of this period, the body prepares for childbirth.

2. **Identify the Parturition Reflex**: The parturition reflex, also known as the fetal ejection reflex, is the physiological process that leads to the delivery of the baby.

3. **Recognize the Role of the Fetus and Placenta**: At the end of the gestation period, the fully developed fetus and the placenta play crucial roles. They send signals to the maternal pituitary gland.

4. **Hormonal Response**: The signals from the fetus and placenta stimulate the maternal pituitary gland to release oxytocin, which is known as the birth hormone or milk-ejecting hormone.

5. **Action of Oxytocin**: Oxytocin acts primarily on the uterine myometrium (the muscular layer of the uterus), causing contractions. These contractions help push the fetus out of the uterus.

6. **Feedback Mechanism**: As the contractions increase, they further stimulate the release of oxytocin from the pituitary, creating a positive feedback loop that intensifies the contractions until delivery occurs.

7. **Conclusion**: The correct answer to the question regarding what induces the parturition reflex at the end of the gestation period is the signals from the fully developed fetus and the placenta.

**Final Answer**: The parturition reflex leading to the delivery of the baby in a human female is induced by the fully developed fetus and the placenta.

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