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Human Body Defence Mechanisms

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Questions and Answers

What role does the skin play in the body's defense system?

It digests pathogens using enzymes.

It prevents pathogens from entering the body. (correct)

It triggers the production of white blood cells.

It produces antibodies to fight pathogens.

Phagocytosis is a process used by white blood cells to proliferate.

False

Name one substance produced by the body that acts as an antiseptic and kills microorganisms.

Earwax

The second line of body defense primarily involves white blood cells that digest pathogens through ______.

<p>phagocytosis</p> Signup and view all the answers

Match the lines of body defense with their descriptions:

<p>First Line = Skin and mucous membranes acting as barriers Second Line = White blood cells digesting pathogens Third Line = Production of antibodies for immunity</p> Signup and view all the answers

Study Notes

Non-Specific Body Defence

Skin: Provides a physical barrier against pathogens
White Blood Cells: Fight pathogens via phagocytosis
- Engulf and destroy pathogens using enzymes

Specific Body Defence

Immunity: Body's ability to fight pathogens by producing antibodies
- Antibodies target and neutralize specific pathogens

First Line of Defence

Skin: A barrier that prevents pathogen entry unless wounded
- Sweat and sebum contain chemicals that kill microorganisms
Mucous Membranes: Line the digestive and respiratory tracts
- Trap pathogens and prevent entry
- Earwax, tears, and vaginal secretions have antiseptic properties that kill microorganisms

Second Line of Defence

White Blood Cells: Employ phagocytosis to destroy pathogens
- Ingest and break down pathogens using enzymes

Third Line of Defence

Immunity: Provides long-term protection against specific pathogens
- Body develops memory cells that recognize and rapidly respond to previously encountered pathogens

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Description

Explore the intricacies of the human body's defence system in this quiz. Learn about the non-specific and specific body defence mechanisms, including the roles of skin, white blood cells, and immunity. Test your knowledge on the first, second, and third lines of defence against pathogens.