📘 Placenta (Important for Obstetrics, Anatomy & Physiology, Community Health Nursing, NHM, AIIMS, GPSC Staff Nurse Exams) ✅ 1. Introduction / Definition: The placenta is a temporary, disc-shaped organ that forms during pregnancy, connecting the mother and fetus.It facilitates the exchange of nutrients, gases, and waste products, while also serving endocrine, immunologic, and metabolic functions. ✅ 2. Formation and Development: ✅ 3. Structure of Placenta: ✅ 4. Circulation: ✅ 5.