Lymphatic System and Immunity

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A collection of vocabulary flashcards covering key concepts related to the lymphatic system and immunity.

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19 Terms

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Lymphoid System

Works to defend the body from pathogens such as viruses, bacteria, fungi, and parasites.

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Pathogens

Microscopic organisms that cause disease.

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Lymphocytes

Cells that are part of the immune response, identifying and attacking specific pathogens.

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Lymph

A fluid similar to plasma but does not contain plasma proteins.

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Lymphatic Vessels

Vessels that carry lymph from peripheral tissues to the venous system.

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Thymus

An organ where T cells mature, located in the mediastinum.

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Spleen

An organ that filters blood, removes abnormal blood cells, and initiates immune responses.

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Nonspecific Defenses

General defense mechanisms that protect against a wide range of pathogens.

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Specific Defenses

Targeted immune responses developed after exposure to specific pathogens.

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Interferons

Small proteins released by virus-infected cells that interfere with viral replication.

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MHC Proteins

Major Histocompatibility Complex proteins that present antigens on cell surfaces.

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B cells

A type of lymphocyte that produces antibodies in response to antigens.

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T cells

Lymphocytes responsible for cell-mediated immunity, including helper and cytotoxic functions.

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Antibodies

Proteins produced by B cells that neutralize or eliminate antigens.

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Primary Response

The initial immune response upon first exposure to an antigen.

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Secondary Response

The more robust and rapid immune response upon subsequent exposures to the same antigen.

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Macrophages

Large phagocytic cells that engulf and destroy pathogens.

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Natural Killer Cells

A type of lymphocyte that attacks and destroys abnormal cells such as cancer cells.

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Inflammation

A localized immune response triggered by cell injury or infection.