Parturition || VVI 5 Marks Question | Bihar Board Exam 2026 | Class 12 Biology ||
Автор: KINGDOM OF BIOLOGY
Загружено: 2025-12-22
Просмотров: 144
Parturition
Parturition is the process of childbirth, in which the fully developed baby (foetus) is delivered from the mother’s uterus.
It usually occurs after 9 months of pregnancy (≈ 280 days).
Stages of Parturition 🧠🤰
Parturition occurs in 3 main stages:
1. Dilation Stage 🔓
Cervix (mouth of uterus) softens and widens
Uterus starts strong rhythmic contractions
Cervix dilates up to 10 cm
🕒 Longest stage of labor
2. Expulsion Stage 👶
Fully dilated cervix
Strong uterine contractions push the baby out
Baby comes out through the birth canal (vagina)
🎉 Baby is born in this stage
3. Placental Stage 🧬
After baby’s birth
Placenta and foetal membranes are expelled
Also called afterbirth
🩸 Prevents infection and bleeding
Hormonal Control of Parturition 🧪
Oxytocin hormone plays a major role
Released from pituitary gland
Increases uterine contractions
➡️ More contractions → more oxytocin (positive feedback)
Summary (Super Easy) ⭐
Parturition = Childbirth 👶
Occurs after 9 months 🤰
3 stages:
🔓 Dilation of cervix
👶 Birth of baby
🧬 Removal of placenta
Oxytocin controls contractions 🧪
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