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Foundation Sciences · Embryology
Placental Function and Transport
The placenta exchanges gases, nutrients and waste between maternal and foetal circulations and produces hormones essential for pregnancy maintenance.
📌 Learning Objectives
- Describe the underlying mechanism of Placental Function and Transport.
- Identify the key clinical features and complications of Placental Function and Transport.
- Outline the appropriate investigations and management of Placental Function and Transport.
- Discuss the implications for patients and families of Placental Function and Transport.
📋 Overview
Maternal blood bathes chorionic villi in intervillous spaces; foetal blood flows in capillaries within the villi. The placenta produces hCG, progesterone, oestrogens, hPL and CRH.
🔬 Basic Science
Maternal blood bathes chorionic villi in intervillous spaces; foetal blood flows in capillaries within the villi. The placenta produces hCG, progesterone, oestrogens, hPL and CRH.
🏥 Clinical Relevance
Many drugs cross the placenta; teratogenic risk depends on timing and agent.
🧪 Investigations
Investigation depends on clinical context: relevant blood tests, imaging, and specific genetic or histopathological tests as appropriate. Refer to specialist services where indicated.
💊 Management
Management is condition-specific and typically multidisciplinary, combining medical therapy, surgical intervention where appropriate, supportive care, and family/genetic counselling.
Revision Resources – expand the sections below for high-yield notes, exam pearls, key facts and further reading.
MLA High-Yield Notes & Quick Revision ⌄
Common SBA themes: recognising the underlying mechanism, identifying classic clinical features, and choosing the first-line investigation or management step. Watch for inheritance pattern and characteristic associations.
placenta
hcg
placental insufficiency
iugr
anti-d
- The placenta produces hCG, progesterone, oestrogens, hPL and placental CRH.
- Maternal and foetal blood do not normally mix; exchange occurs across the placental barrier.
- Placental insufficiency is a major cause of IUGR.
- Lipid-soluble, low molecular weight drugs cross the placenta readily.
- Rhesus negative mothers should receive anti-D prophylaxis to prevent haemolytic disease of the newborn.
Exam Pearls ⌄
⭐ High Yield
The placenta produces hCG, progesterone, oestrogens, hPL and placental CRH.
Maternal and foetal blood do not normally mix; exchange occurs across the placental barrier.
Placental insufficiency is a major cause of IUGR.
Lipid-soluble, low molecular weight drugs cross the placenta readily.
Rhesus negative mothers should receive anti-D prophylaxis to prevent haemolytic disease of the newborn.
💡 Clinical Pearl
Placenta: Many drugs cross the placenta; teratogenic risk depends on timing and agent.
⚠️ Exam Tip — Common Mistakes
Confusing the mechanism of Placental Function and Transport with related conditions.
Missing classic clinical features of Placental Function and Transport in SBA stems.
Failing to consider Placental Function and Transport in the differential diagnosis.
Key Facts ⌄
The placenta produces hCG, progesterone, oestrogens, hPL and placental CRH.
Maternal and foetal blood do not normally mix; exchange occurs across the placental barrier.
Placental insufficiency is a major cause of IUGR.
Lipid-soluble, low molecular weight drugs cross the placenta readily.
Rhesus negative mothers should receive anti-D prophylaxis to prevent haemolytic disease of the newborn.
Related Topics ⌄
References ⌄
- GMC MLA Content Map
- NICE Clinical Knowledge Summaries
- BMJ Best Practice
Further Resources
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