🛡️01
The Lymphatic System
Vessels, nodes, spleen, thymus, and tonsils on the body.
Open →🏰02
The Lines of Defense
Barriers, innate, and adaptive — three layers deep.
Open →🔥03
The Inflammatory Response
Histamine, vasodilation, and phagocytes — red, hot, swollen, sore.
Open →🦠04
T Cells
Helper, cytotoxic, memory, and regulatory T cells.
Open →🏭05
B Cells & Antibodies
One B cell becomes an antibody factory, step by step.
Open →💉06
Types of Immunity
Active vs passive, natural vs artificial — and how vaccines work.
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