Diagrams
Coming Soon…
Lessons:
Lesson 1: Innate vs. Adaptive Immunity—The Body’s Two-Part Defense System
Here’s the irony that makes immunology both fascinating and slightly horrifying: Marcus’s immune system is too good at its job. That shiny new liverA large organ that produces bile, detoxifies blood, and stores nutrients. that saved his life? His body wants to destroy it. Why? Because his immune system is like an overzealous security guard who sees a perfectly legitimate delivery truck and immediately calls in a SWAT team. The liver isn’t diseased, infected, or malfunctioning—it’s just… someone else’s. And apparently, that’s a crime punishable by cellular death. So now Marcus has to take medications that deliberately sabotage his own defense system. Welcome to transplant medicine, where we have to break your immune system to save your life. In this lesson, we’ll explore why the body is so paranoid about “non-self” tissue, how it tells friend from foe, and why Marcus’s doctors are very carefully weakening one part of his immune system while desperately hoping the other part still works well enough to keep him alive. No pressureThe force exerted by gases in the respiratory system, affecting airflow and gas exchange. or anything.
Key Concepts:
- Self vs. Non-Self Recognition: How the immune system uses antigensMolecules on the surface of cells that trigger an immune response. and MHC moleculesGroups of atoms bonded together. to identify foreign tissue
- Innate Immunity Characteristics: Immediate, non-specific responses that form the first line of defense
- Adaptive Immunity Characteristics: Slower, highly specific responses with immunological memoryThe ability to store and recall information.
Pre-Class Lectures
- Intro to the Lymphatic System 6 minutes
- Lymphoid Tissues 5 minutes
- Lymphoid Organs 8 minutes
- Barriers, Fever, and Inflammation 11 minutes
- Innate Cells 11 minutes
- Antimicrobial Proteins 8 minutes – OPTIONAL if time-pressed
Post Class Lectures
- Cells of the Immune System 9 minutes.
- Antigens 4 minutes
Lesson 2: Cell-Mediated Immunity—Why Marcus Needs Immunosuppression
We’re about to dive into the absolute superstars of your adaptive immune system: T cellsThe basic structural and functional units of life.. These cells are incredible—they can recognize a single foreign protein on the surface of a cell among millions of your own proteinsLarge molecules made of amino acids with various functions in the body., decide that cell needs to die, and then actually kill it. It’s like having microscopic assassins patrolling your body 24/7, and they are GOOD at their job. Here’s what makes this lesson so interesting: we’re going to watch this amazing system in action… and then figure out how to shut it down. Because as awesome as T cells are at destroying infected cells and cancer cells, they’re equally enthusiastic about destroying Marcus’s new liver. His CD8 cells would absolutely demolish that transplanted tissue if given half a chance! So we need to understand exactly how these cellular killers work—their activation signals, their attack mechanisms, their coordination with helper cells—so we can strategically interfere with their function using immunosuppressive drugs. It’s like learning how a lock works so you can pick it.
Key Concepts:
- T Cell Activation and Function: How CD4 and CD8 T cells recognize foreign MHC molecules on transplanted tissue
- Cytotoxic Immunity: The process by which CD8 T cells would kill cells in the transplanted liver
- Immunosuppression Mechanisms: How medications selectively suppress T cell activity while attempting to preserve other immune functions
Pre-Class Lectures
- Cytotoxic Immunity 12 minutes
Post Class Lectures
- Immunoglobulins 8 minutes
- Humoral Immunity 7 minutes
Lesson 3: Humoral Immunity—Understanding Peanut Allergies
Time to switch gears from T cells to B cells, and trust me—this is going to make SO much sense once we put all the pieces together. We’re investigating why Sarah’s immune system decided that peanuts—a perfectly harmless food that millions of people eat every day—were dangerous invaders that needed a full-scale alarm response. And we’re talking red-alert, all-hands-on-deck, release-all-the-chemicals kind of response! The key players here are antibodies, specifically a troublemaker called IgE, and some very dramatic cells called mast cells that basically explode when they get the signal. Here’s what I love about this lesson: you’re going to trace the entire pathway from “peanut enters mouth” to “throat swells shut and someone’s calling 911.” Every single step makes sense once you understand how humoral immunity works. You’ll learn why this happened to Sarah in the first place, how her B cells got trained to panic about peanuts, and why her body manufactured these very specific IgE antibodies. By the end of this lesson, you’ll be able to explain exactly what went wrong in Sarah’s immune system—and you’ll have all the tools you need to solve the mystery of how this allergy jumped from Sarah to Marcus.
Key Concepts:
- B Cell Activation and Differentiation: How B cells become plasma cellsImmune cells that develop from B cells and produce antibodies. and memory B cells
- Immunoglobulin Structure and Function: Especially the unique role of IgE in allergic responses
- Mast Cell Degranulation: How IgE antibodies trigger the release of histamine and other inflammatory mediators
Pre-Class Lectures
- Immunoglobulins 8 minutes
- Humoral Immunity 7 minutes
- Passive/Active Immunity 10 minutes
Post Class Lectures
- Auto-Immune Diseases 15 minutes
MiniLectures
Cells of the Immune System
9 Minutes
MiniLectures
Read about the Histology
By the End of This Module
You Will be Able to:
- Describe surface membrane barriers and their protective functions.
- Explain the importance of phagocytosis and natural killer cells in innate body defense.
- Describe the inflammatory process. Identify several inflammatory chemicals and indicate their specific roles.
- Name the body’s antimicrobial substances and describe their function.
- Explain how fever helps protect the body.
- Define antigen and describe how antigens affect the adaptive defenses.
- Define complete antigen, hapten, and antigenic determinant.
- Compare and contrast the origin, maturation process, and general function of B and T lymphocytes.
- Define immunocompetence and self-tolerance, and describe their developmentThe process of growth and differentiation. in B and T lymphocytes.
- Name several antigen-presenting cells and describe their roles in adaptive defenses.
- Define humoral immunity.
- Describe the process of clonal selection of a B cell.
- Recount the roles of plasmaThe liquid component of blood. cells and memory cells in humoral immunity.
- Compare and contrast active and passive humoral immunity.
- Describe the structure of an antibody monomer, and name the five classes of antibodies.
- Explain the function(s) of antibodies and describe clinical uses of monoclonal antibodies.
- Define cellular immunity and describe the process of activation and clonal selection of
- T cells.
- Describe the roles of different types of T cells.
- Describe T cell functions in the body.
- Describe the four varieties of grafts.
- Indicate the tests ordered before an organ transplant is done, and methods used to prevent transplant rejection.
- Give examples of immunodeficiency diseases and of hypersensitivity states.
- Cite factors involved in autoimmune disease.
List of terms
- liver
- pressure
- antigens
- molecules
- memory
- cells
- proteins
- plasma cells
- development
- plasma