H2 Biology Extension A - The Immune Response: How B Cells and T Cells Defend the Body

What you will learn

• Contrasts non-specific innate immunity (skin, lysozyme, phagocytes) with specific adaptive immunity using B and T cells.
• Antigen presentation: a macrophage shows pathogen fragments on MHC class II so a helper T cell can activate the response.
• Humoral response: matched B cells undergo clonal expansion into plasma cells (antibody factories) and long-lived memory B cells.