3rd Line of Defense Class 12 Federal Board | Chapter 9 Immunity | FBISE New Syllabus

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​3rd Line of defense class 12 | Chapter 09 Immunity New Book Biology Federal Board (FBISE)
​In this lecture, we explain the Third Line of Defence (Specific Immunity) from Class 12 Biology Chapter 9, based on the New Book 2025-26 (NBF) for Federal Board students.

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​📚 FULL CHAPTER PLAYLIST:
📺 Class 12 Biology (FBISE New Book):
[    • Class 12 Biology Federal Board New Book Le...   ]
(Watch the complete series in order to score 100% in your exams!)

​⏰ TIMESTAMPS (Key Topics):
00:00 - Introduction & Recap
07:47 - What is the 3rd Line of Defense?
14:55 - Antigen Presentation (MHC Proteins)
22:35 - Types of T-Cells (Helper & Cytotoxic)
27:12 - Antibody Structure (Heavy & Light Chains)
32:19 - Primary vs Secondary Immune Response

✅​Topics Covered:
↪️​Humoral vs Cell-Mediated Immunity
↪️​Role of B-cells and T-cells
↪️​Structure of Immunoglobulins (Antibodies)
↪️​Adaptive Immune System for FBISE Class 12

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