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HomeHomework HelpbiologyImmune System Overview

Immune System Overview

The immune system is a complex network of cells, tissues, and organs that work together to defend the body against pathogens; it comprises two main components: innate immunity, which provides immediate, non-specific defense mechanisms, and adaptive immunity, which generates a targeted response through the activation of specific lymphocytes and the production of antibodies.

intermediate
3 hours
Biology
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Overview

The immune system is a complex network that protects the body from harmful pathogens like bacteria and viruses. It consists of two main components: innate immunity, which provides immediate, non-specific defense, and adaptive immunity, which develops over time and targets specific pathogens. Underst...

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Key Terms

Pathogen
An organism that causes disease.

Example: Bacteria, viruses, and fungi are all types of pathogens.

Antibody
A protein produced by B cells that binds to specific antigens.

Example: Antibodies help neutralize viruses.

Phagocyte
A type of immune cell that engulfs and digests pathogens.

Example: Macrophages are a type of phagocyte.

Antigen
A substance that triggers an immune response.

Example: Proteins on the surface of pathogens are antigens.

Innate Immunity
The body's first line of defense that is non-specific.

Example: Skin and mucous membranes are part of innate immunity.

Adaptive Immunity
A specific immune response that develops over time.

Example: Vaccination enhances adaptive immunity.

Related Topics

Autoimmune Diseases
Conditions where the immune system mistakenly attacks the body's own cells.
advanced
Vaccinology
The study of vaccines and how they work to prevent diseases.
intermediate
Immunology
The branch of biology that deals with the immune system and its functions.
advanced

Key Concepts

Innate ImmunityAdaptive ImmunityImmune ResponsePathogens