Dive into a comprehensive 31-minute video lecture exploring the four types of hypersensitivity reactions (Type I, II, III, and IV HSN) in immunology and physiology. Learn the key differences between allergy and hypersensitivity while gaining a thorough understanding of each reaction type. Discover the mechanisms, characteristics, and clinical implications of these immune responses through detailed explanations and examples. Enhance your knowledge of immunology for medical exams such as NEET, USMLE, NCLEX, PANCE, COMLEX, and ASCP with this in-depth educational resource from Medicosis Perfectionalis.