Explaining on Instagram: "Blood types play a crucial role in medicine because not all blood is compatible. Each person’s blood is marked by specific antigens — like A, B, AB, or O — and an Rh factor that’s either positive or negative. These markers determine whether a transfusion will save a life or trigger a dangerous immune reaction. 🩸⚠️ Type O negative is considered the universal donor, while AB positive is the universal recipient, making them especially important in emergencies. Matching bl