Biology - Human Body Systems - Immune system - Immune Defense Categorizer
Three bins: '1st Line (Barriers)', '2nd Line (Non-specific)', '3rd Line (Specific)'. 12 cards: 'Skin' (1st), 'Phagocytes eating bacteria' (2nd), 'Antibodies matching antigens' (3rd), 'Mucus in nose' (1st), 'Inflammation and swelling' (2nd), 'Memory cells for future attacks' (3rd), 'Stomach acid' (1s