Скачать или смотреть IGCSE Biology|Chapter #10 Diseases & Immunity(

*IGCSE Biology Video Lecture: Primary & Secondary Immune Response by Lymphocytes*

*Description:*

In this IGCSE Biology video, we explore how the body fights infections through **primary and secondary immune responses**, focusing on the key role of **lymphocytes (B-cells and T-cells)**.

🔬 *What You’ll Learn:*
The difference between *primary* (first exposure) and *secondary* (subsequent exposure) immune responses.
How *B-lymphocytes* produce antibodies to neutralize pathogens.
The role of *memory cells* in providing long-term immunity.
Why the secondary response is *faster and stronger* than the primary response.

💡 *Perfect for IGCSE students* preparing for exams, this video simplifies complex concepts with clear diagrams and real-life examples (like vaccines).

📌 *Key Terms:* Antigens, antibodies, memory cells, immunity, vaccination.

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