Unit 31 Immune System

KEY CONCEPT Germs cause many diseases in humans.

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KEY CONCEPT The immune systems consists of organs, cells, and molecules that fight infections.

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[object Object],[object Object],[object Object],[object Object],antibody pathogens

KEY CONCEPT The immune system has many responses to pathogens and foreign cells.

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[object Object],[object Object],[object Object],[object Object],virus antigens

[object Object],[object Object],pathogen antigens T cell receptors activated T cells antigens memory T cells

[object Object],[object Object],memory B cells activated B cells antibodies B cell T cell pathogen

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KEY CONCEPT Living in a clean environment and building immunity help keep a person healthy.

[object Object],[object Object],[object Object],A bacterium carries genes for antibiotic resistance on a plasmid. A copy of the plasmid is transferred through conjugation. Resistance is quickly spread through many bacteria.

[object Object],[object Object],[object Object],[object Object],[object Object],A memory B cell is stimulated when the real pathogen binds to it. 2 The B cell quickly activates and makes antibodies that fight the pathogens before you get sick. 3 Antigens in a vaccine trigger an immune response, and memory B cells are made. 1 memory B cells

KEY CONCEPT An overactive immune system can make the body very unhealthy.

KEY CONCEPT When the immune system is weakened, the body cannot fight off disease.

[object Object],[object Object],[object Object],[object Object],HIV T cell dead T cell antibody activated B cell

Unit 31 Immune System

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Unit 31 Immune System