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Biology /5.1: Cell Recognition and The Immune System

5.1: Cell Recognition and The Immune System

Biology6 CardsCreated 7 months ago

This deck covers key concepts related to cell recognition and the immune system, including definitions of pathogens, defense mechanisms, and lymphocyte function.

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Define pathogen

An infectious organism which spreads communicable diseases

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Key Terms

Term

Definition

Define pathogen

An infectious organism which spreads communicable diseases

Define non-specific defence mechanisms and give two examples

Response is immediate and the same for all pathogens eg. physical skin barrier and phagocytosis

Define specific defence mechanisms and give two examples

Response is slower and specific to each pathogen eg. cell mediated response and humoral response

What do the protein molecules on the surface of cells help to identify?

-Pathogens
-Non-self material
-Toxins
- Abnormal body cells

How do lymphocytes recognise cells belonging to the body?

Lymphocytes that have receptors which bind to self cells are destroyed or suppressed -This leaves no lymphocytes that can bind to self cells and so ly...

After a pathogen gains entry to the body it is often a number of days before the body’s immune system begins to control it. Suggest a possible reason why this is so.

A specific mechanism distinguishes between different pathogens but responds more slowly than a non-specific mechanism.

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5.1: Cell Recognition and The Immune System

Term	Definition
Define pathogen	An infectious organism which spreads communicable diseases
Define non-specific defence mechanisms and give two examples	Response is immediate and the same for all pathogens eg. physical skin barrier and phagocytosis
Define specific defence mechanisms and give two examples	Response is slower and specific to each pathogen eg. cell mediated response and humoral response
What do the protein molecules on the surface of cells help to identify?	-Pathogens -Non-self material -Toxins - Abnormal body cells
How do lymphocytes recognise cells belonging to the body?	Lymphocytes that have receptors which bind to self cells are destroyed or suppressed -This leaves no lymphocytes that can bind to self cells and so lymphocytes only respond to foreign material
After a pathogen gains entry to the body it is often a number of days before the body’s immune system begins to control it. Suggest a possible reason why this is so.	A specific mechanism distinguishes between different pathogens but responds more slowly than a non-specific mechanism.