Why the immune system switches between attack and tolerance, and how to read its key decisions on exams
4 sections · 7 lessons
Define the problem of threat versus tolerance and identify the major checkpoints that shape immune responses.
1 lessonCompare barrier defenses, innate cells, and antigen recognition rules so you can predict how the immune system responds to different pathogen scenarios.
2 lessonsTrace how B cells, antibodies, and T cells activate, specialize, and regulate immune outcomes, then distinguish MHC I from MHC II in exam-style cases.
3 lessonsApply immune decision logic to vaccination, memory, and the major ways immune control goes wrong.
1 lessonEvery lesson in order.
7 lessons
Immune defense is not just about fighting infection, but about choosing when to respond, what to target, and how to avoid self-damage. This course builds a clear framework for innate and adaptive immunity, antigen recognition, B cells, T cells, antigen presentation, memory, vaccination, and the major failure modes of immune control. It is designed for undergraduate biology students who want a more intuitive grasp of immunology and a better way to reason through exam questions.
Innate and adaptive immunity, antigen recognition by BCRs, TCRs, and MHC, and the activation and effector roles of B cells and T cells. It also covers antigen presentation through MHC I and MHC II, immune memory and vaccination, and the classification of allergy, autoimmunity, and immunodeficiency.
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Something to operate in every section.
Three findings from decades of learning research shaped how every Fenzo lesson is built.
Average pass rate · Freeman et al., PNAS 2014
What the science says
Students in lecture-only classes are 1.5× more likely to fail.
How Fenzo does it
Every Fenzo lesson is interactive. No passive reading or watching, ever.
You work through itAI does it for you
Skill retention over time · with vs. without practice
What the science says
Offloading thinking to AI erodes the very skills you’re trying to build.
How Fenzo does it
Fenzo makes you do the thinking — guided, but never done for you.
Retrieval practiceRe-reading
Long-term recall · retrieval vs. re-reading
What the science says
Recalling information beats re-reading it for building durable understanding.
How Fenzo does it
Lessons weave in quizzes and recall prompts, so it sticks.