HTML
Immune System - HTML
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.
<table>
<thead><tr><th>code</th><th>slug</th><th>name</th><th>description</th><th>category</th></tr></thead>
<tbody><tr><td>1</td><td>innate-immunity</td><td>Innate Immunity</td><td>An immediate, nonspecific immune mechanism present from birth.</td><td>Immunity Classification</td></tr>
<tr><td>2</td><td>adaptive-immunity</td><td>Adaptive Immunity</td><td>An antigen-specific immune mechanism acquired after birth.</td><td>Immunity Classification</td></tr>
<tr><td>3</td><td>b-cells</td><td>B Cells</td><td>Lymphocytes that mature in bone marrow and mediate humoral immunity by producing antibodies.</td><td>Immune Cells</td></tr>
<tr><td>4</td><td>t-cells</td><td>T Cells</td><td>Lymphocytes that mature in the thymus and mediate cellular immunity.</td><td>Immune Cells</td></tr>
<tr><td>5</td><td>antibodies</td><td>Antibodies</td><td>Y-shaped proteins produced by B cells that neutralize pathogens.</td><td>Immune Molecules</td></tr>
<tr><td>6</td><td>helper-t-cells</td><td>Helper T Cells</td><td>T cells with CD4 markers that function as command centers of immune responses.</td><td>T Cell Subsets</td></tr>
<tr><td>7</td><td>cytotoxic-t-cells</td><td>Cytotoxic T Cells</td><td>T cells with CD8 markers that directly kill infected or cancerous cells.</td><td>T Cell Subsets</td></tr>
<tr><td>8</td><td>immunological-memory</td><td>Immunological Memory</td><td>The ability to respond rapidly and vigorously to previously encountered antigens.</td><td>Immune Mechanisms</td></tr></tbody>
</table>