Immune System: How Your Body Recognizes an Invader

How does the immune system recognize an invader and build a targeted response? Follow bacterial protein from a breach in the skin to antigen presentation, T-cell and B-cell interactions, antibodies and immune memory. This science documentary follows one representative extracellular bacterial encounter. See how phagocytosis captures a target, how peptide–MHC presentation differs from intact-antigen recognition, and how antibodies can help other immune cells capture a coated bacterium. These processes overlap in the body; the sequence is separated and time-compressed here to make the information pathway clear. CONTINUE EXPLORING Follow a red blood cell through the body:    • How the Circulatory System Works | A Red B...   Explore the human body series:    • Human Body Explained | Trace the Science   All Trace the Science episodes:    • Science Explained | All Episodes — Trace t...   CHAPTERS 00:00 A fragment survives 00:20 Innate immunity responds 01:08 How phagocytosis captures a target 01:58 Antigen processing and presentation 02:40 Matching T cells and activation 03:37 B cells, helper signals and antibodies 04:26 Antibodies help identify a target 05:22 What immune memory preserves 06:14 Follow the information back 06:39 From a local encounter to defense SOURCES OpenStax — Barrier Defenses and Innate Immunity https://openstax.org/books/anatomy-an... British Society for Immunology — Dendritic Cells https://www.immunology.org/public-inf... British Society for Immunology — Antigen Processing and Presentation https://www.immunology.org/public-inf... British Society for Immunology — T-cell Activation https://www.immunology.org/public-inf... OpenStax — B Lymphocytes and Antibodies https://openstax.org/books/anatomy-an... Janeway et al. — B-cell Activation by Helper T Cells https://www.ncbi.nlm.nih.gov/sites/bo... Trace the Science follows objects, materials and signals to explain how the world works.    / @trace-the-science   #ImmuneSystem #Immunology #ScienceExplained