BIOLOGY | MEDICAL | HEALTH on Instagram: "💠 How Do IUDs Work? (Birth Control Explained) An IUD (Intrauterine Device) is a small, T-shaped device placed inside the uterus to prevent pregnancy. It works in two main ways: 1️⃣ Hormonal IUDs release progestin, which thickens cervical mucus to block sperm and thins the uterine lining — making it hard for an egg to implant. 2️⃣ Copper IUDs release copper ions that are toxic to sperm — stopping them from reaching the egg. ✨ It’s over 99% effective, lon