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The immune system serves as the body's natural defense mechanism against pathogens, including bacteria, viruses, and other foreign substances, by identifying and eliminating them.
The two main types of lymphocytes are B cells, which are responsible for antibody production, and T cells, which play a role in cell-mediated immunity.
B cells contribute to humoral immunity by proliferating and differentiating into plasma cells that secrete antibodies, which bind to specific antigens and facilitate their removal.
Memory B cells are long-lived cells that remain in the body after an initial infection, allowing for a faster and more effective response upon re-exposure to the same antigen.
Clonal selection is the process by which specific B and T cells are activated and proliferate in response to an antigen, ensuring that the immune system can effectively target and eliminate pathogens.
The five classes of antibodies are IgM (first response), IgG (most abundant, long-term immunity), IgA (mucosal immunity), IgE (allergic responses), and IgD (B cell receptor).
T cells recognize antigens through T cell receptors (TCRs) that bind to peptide fragments presented on major histocompatibility complex (MHC) molecules on antigen-presenting cells.
T helper cells (TH) assist other immune cells by releasing cytokines, while cytotoxic T cells (Tc) directly kill infected or cancerous cells.
MHC molecules are crucial for the immune system as they present antigenic peptides to T cells, enabling the recognition of foreign antigens and the activation of adaptive immunity.
The afferent phase involves antigen presentation to T cells, while the efferent phase involves the activation of lymphocytes that migrate to tissues to eliminate the antigen.
Antibodies bind to antigens, neutralizing them and marking them for destruction by other immune cells, such as macrophages and neutrophils.
Cytokines are signaling molecules that mediate and regulate immunity, inflammation, and hematopoiesis, facilitating communication between immune cells.
The spleen filters blood, removes old or damaged red blood cells, and serves as a site for the activation of immune responses against blood-borne pathogens.
MALT is a component of the immune system found in mucosal tissues, such as the gut and respiratory tract, playing a critical role in protecting against pathogens entering through mucosal surfaces.
Interferons are proteins produced in response to viral infections that enhance the immune response by activating immune cells and inhibiting viral replication.
The rough endoplasmic reticulum in plasma cells is abundant in ribosomes, facilitating the synthesis and secretion of large quantities of antibodies.
The four subclasses of IgG (IgG1, IgG2, IgG3, IgG4) differ in their ability to activate complement and bind to Fc receptors, influencing their roles in immune responses.
Recirculation allows T and B cells to efficiently locate and respond to antigens throughout the body, enhancing the overall effectiveness of the immune response.
Ocular immunology is the study of the immune system as it relates to the eye, important for optometrists as they may encounter immune-related eye conditions and prescribe therapeutic agents.
Immunology research has advanced significantly due to improvements in molecular testing techniques, leading to better understanding and treatment of immune-related diseases.
The pass mark for the CET credits awarded by the College of Optometrists for this article is 60%.