PIMSO 2023 - Science - Secondary 4 - National Round Question 4

Question 4

1. Antigen-presenting cell presents foreign antigen bound to MHCII and activates naïve CD4+ T cells.
2. Naïve CD4+ T cells are activated to become helper cells.
3. Naïve CD8+ T cells are activated to become natural killer cells.
4. Helper T cells activate naïve B cells to become plasma cells.
5. Plasma cells secrete antibodies into the bloodstream to bind to foreign bodies.