Immunobiology — Chapter Summary
Telangana Open School (TOSS) · Class 12 · Biology
Summary of Immunobiology for Telangana Open School (TOSS) Class 12 Biology. Part of the Telangana Open School (TOSS) Class 12 Biology syllabus.
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Overview
The human body is constantly exposed to harmful microorganisms like bacteria, viruses, and fungi. However, we are protected by a powerful defense system known as the immune system. This chapter explores how the body defends itself through various mechanisms, focusing on immunity — the ability to res
Key Concepts
The immune system can distinguish between
The immune system can distinguish between the body's own cells (self) and foreign invaders like bacteria or viruses (non-self). This ability prevents
The body uses three layers
The body uses three layers of protection: First line includes physical barriers like skin and mucus; second line involves non-specific responses like
Innate immunity is present from birth
Innate immunity is present from birth and provides general protection through barriers and phagocytes. Acquired immunity develops over time and is spe
B
B-cells produce antibodies that neutralize pathogens in body fluids (humoral immunity), while T-cells directly attack infected or cancerous cells (cel
Antigens are foreign molecules (usually proteins)
Antigens are foreign molecules (usually proteins) that trigger an immune response. Antibodies are Y-shaped proteins produced by plasma cells (derived
Learning Objectives
- Explain the concept of 'self' and 'non-self'.
- Understand the lines of defence in the body.
- Describe the types of defence mechanisms in the body.
- List and describe various cells of the immune system.
- Differentiate between cellular and humoral immunity; innate and acquired immunity.
Frequently Asked Questions
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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