unit: cell recognition and immune system (Condensed unit)
this is lesson 3 out of 4

AQA A Level Biology (Cell‑Mediated & Humoral Immunity)
This fully print‑free lesson introduces students to the specific immune response, focusing on the roles of T lymphocytes and B lymphocytes in defending the body against pathogens. The lesson is designed for whole‑class teaching using interactive whiteboard tasks and structured questioning throughout.
Students work through a sequence of on‑screen activities, including clearly labelled diagrams, structured gap‑fill tasks, and step‑by‑step explanations of cell‑mediated and humoral immunity. The primary and secondary immune responses are explored in detail, with emphasis on the roles of plasma cells, antibodies, and memory cells, supported by visual timelines and exam‑focused explanations.
The lesson includes AQA past exam questions, challenge questions to stretch higher‑attaining students, and review questions to consolidate understanding and reinforce key terminology. All tasks are self‑checking, with answers revealed on click, allowing for immediate feedback, discussion, and correction. No printing is required at any stage.

Learning Objectives (LOs)
By the end of this lesson, students will be able to:
Describe the two main types of lymphocytes
Explain the role of T cells in cell‑mediated immunity
Explain the role of B cells in humoral immunity
Explain the roles of plasma cells and antibodies in the primary immune response
Explain the role of memory cells in the secondary immune response
Explain how antigenic variation affects the body’s response to infection