This pathway provides an in-depth look at anatomy of the lymphatic & immune systems, barrier defenses & the innate immune response, the adaptive immune response: T-lymphocytes & their functional types, the adaptive immune response: B-lymphocytes & antibodies, the immune response against pathogens, diseases associated with depressed or overactive immune responses, and transplantation & cancer immunology. The pathway also provides vocabulary support for these topics, as well as opportunities for learners to self-assess their understanding by analyzing figures and answering questions.