INI

Immune System - INI

The immune system is a complex biological defense system that protects the body from pathogens such as viruses and bacteria. It consists of two main mechanisms: innate immunity and adaptive immunity. Innate immunity is an immediate defense mechanism present from birth, with neutrophils, macrophages, and NK cells playing major roles. Adaptive immunity is an antigen-specific immune response acquired after birth, characterized by antibody production by B cells and cellular immunity by T cells. B cells mediate humoral immunity, producing antigen-specific antibodies that neutralize pathogens. T cells mediate cellular immunity, with CD4+ helper T cells coordinating immune responses and CD8+ cytotoxic T cells directly eliminating infected or cancerous cells. These immune cells work in coordination, forming immunological memory to enable rapid and effective defense upon re-exposure to pathogens.

immune system innate immunity adaptive immunity B cells T cells antibodies biology medicine

[item.innate-immunity]
code=1
slug=innate-immunity
name=Innate Immunity
description=An immediate, nonspecific immune mechanism present from birth.
category=Immunity Classification

[item.adaptive-immunity]
code=2
slug=adaptive-immunity
name=Adaptive Immunity
description=An antigen-specific immune mechanism acquired after birth.
category=Immunity Classification

[item.b-cells]
code=3
slug=b-cells
name=B Cells
description=Lymphocytes that mature in bone marrow and mediate humoral immunity by producing antibodies.
category=Immune Cells

[item.t-cells]
code=4
slug=t-cells
name=T Cells
description=Lymphocytes that mature in the thymus and mediate cellular immunity.
category=Immune Cells

[item.antibodies]
code=5
slug=antibodies
name=Antibodies
description=Y-shaped proteins produced by B cells that neutralize pathogens.
category=Immune Molecules

[item.helper-t-cells]
code=6
slug=helper-t-cells
name=Helper T Cells
description=T cells with CD4 markers that function as command centers of immune responses.
category=T Cell Subsets

[item.cytotoxic-t-cells]
code=7
slug=cytotoxic-t-cells
name=Cytotoxic T Cells
description=T cells with CD8 markers that directly kill infected or cancerous cells.
category=T Cell Subsets

[item.immunological-memory]
code=8
slug=immunological-memory
name=Immunological Memory
description=The ability to respond rapidly and vigorously to previously encountered antigens.
category=Immune Mechanisms