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Questions and Answers
What role does the skin play in the body's defense system?
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.
Phagocytosis is a process used by white blood cells to proliferate.
False (B)
Name one substance produced by the body that acts as an antiseptic and kills microorganisms.
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 ______.
The second line of body defense primarily involves white blood cells that digest pathogens through ______.
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Match the lines of body defense with their descriptions:
Match the lines of body defense with their descriptions:
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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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