Thank you for warning us !! :)
After the macrophage fails the Helper T Cell stimulates the B cells (create antibodies) if pathogen is extracellular and Cytotoxic T Cells (killer T cells, release perforin) if pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells.
I think that it’s tension but I’d double check that.
Answer:
Alveoli
Explanation:
(If the context is about the respiratory system)