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Signals for parturition originate from:

1. Both placenta as well as fully developed foetus
2. Oxytocin released from maternal pituitary
3. Placenta only
4. Fully developed foetus only

Correct answer: Both placenta as well as fully developed foetus

Solution

The onset of labor is initiated by signals from both the fully developed foetus and the placenta. Together they help trigger hormonal changes that start uterine contractions and parturition.

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