Our first two lines of immune defense -- our innate immune system 00:21 - Three lines of defence 00:48 - Distinctions between innate and adaptive systems 03:05 - Physico-chemical barriers 05:09 - Physiological barriers, fever 07:18 - Inflammation 12:11 - Phagocytosis 15:32 - Complement system 17:45 - Interferons 20:13 - Iron-binding proteins, antimicrobial peptides Related videos and references: https://irwanhanish.com/introduction-immunology/ --- I learn and teach Immunology, Microbiology, and Philosophy of Science at: Universiti Putra Malaysia https://upm.edu.my/?L=en Faculty of Biotechnology and Biomolecular Sciences https://biotech.upm.edu.my/?L=en --- I have been on a social media hiatus to work on my mental health. I eventually closed my accounts in 2021. 🎓 To contact me or my colleagues about academic work: https://bit.ly/3pLzlJm 📖 To contact me about learning and life: https://irwanhanish.com/contact/