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t grows, nourishes, protects, detoxifies, and disappears — all within 9 months. In this fascinating and medically accurate video, we explore the placenta — the temporary but essential organ that forms during pregnancy to sustain new life. Often overlooked or misunderstood, the placenta is the ultimate life support system that connects mother and baby, and it plays a role more complex than many vital organs combined. This is not just a structure — it’s an intelligent interface between two humans, adapting, protecting, and responding in real time. From implantation to birth, we follow its incredible journey. 🧬 What You’ll Learn in This Video: ✅ How the Placenta Forms: Begins forming within days after fertilization, as the blastocyst implants into the uterine wall. Trophoblast cells invade the endometrium and develop into the chorionic villi — early foundations of the placenta. By the end of the first trimester, the placenta is fully functional. ✅ Week-by-Week Development Highlights: Week 4–5: Early placental structures begin establishing maternal-fetal circulation. Week 8–12: Placenta takes over hormone production from the corpus luteum. Week 20+: Fully developed placental barrier and nutrient exchange systems. Third Trimester: The placenta continues growing and thickening, matching the baby’s needs. 🩺 What the Placenta Does: 🌬️ Gas Exchange: Delivers oxygen from maternal blood to the fetus and removes carbon dioxide in the opposite direction — like a fetal lung. 🍽️ Nutrient Transport: Transports glucose, amino acids, fatty acids, vitamins, and minerals to the fetus for growth and development. 🧪 Waste Removal: Clears out fetal waste products like urea, uric acid, and bilirubin into the maternal bloodstream. 🧠 Hormone Factory: Produces vital hormones such as: hCG (human chorionic gonadotropin): Confirms pregnancy and maintains the uterine lining. Progesterone and Estrogen: Maintain the uterine environment and prevent contractions. Human Placental Lactogen (hPL): Aids in maternal metabolism to support fetal growth. 🛡️ Immunological Barrier: Selectively allows maternal antibodies (IgG) to cross, protecting the fetus from infection. Prevents maternal immune system from attacking the genetically distinct fetus. 🔄 Two Separate Blood Supplies: Maternal and fetal blood never mix. Nutrients and gases cross the placental barrier via diffusion and active transport. 🧠 Mind-Blowing Facts About the Placenta: It's the only transient human organ — it forms and is discarded naturally. The placenta weighs about 500–600 grams (1.1–1.3 pounds) at birth. It contains fetal cells that can remain in the mother's body for decades (a phenomenon called microchimerism). It creates a highly regulated immune environment where a mother’s body tolerates a “foreign” organism — her baby. 🧬 What Happens If the Placenta Doesn’t Work Properly? Complications include: Placenta previa: Placenta blocks the cervix. Placental abruption: Premature separation from the uterine wall. Placenta accreta: Abnormal attachment deep into the uterine wall. Insufficient placental function: Can lead to intrauterine growth restriction (IUGR), preterm birth, or preeclampsia. 👩⚕️ After Birth – What Happens to the Placenta? It is delivered shortly after the baby, in what’s called the third stage of labor. In most cultures, the placenta is discarded, but in some traditions, it’s buried, encapsulated, or even consumed. In medical settings, it is sometimes examined to assess fetal health and delivery complications. 🔍 Why the Placenta Deserves More Attention: The placenta is one of the most powerful and mysterious organs in the human body — and it exists only to support a developing life. Understanding how it works can help us better care for pregnancies, detect complications early, and unlock new insights into fetal health, maternal wellness, and even future stem cell therapies.