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Body Sys2-Lymphatic

Medical Terminology

TermDefinition
immunity the ability to resist a harmful substance or pathogen
body system a collection of organs or structures whose coordinated activities perform one or more vital functions
lymphatic system a system that helps circulate blood and fight off disease and infection; it works with, and forms a part of, two other body systems: the circulatory system and the immune system
circulatory system the body system that moves blood throughout the body
immune system a collection of cells, tissues, and organs that fights disease and infection
plasma the liquid part of blood that is mostly water and composes about 55 percent of blood
interstitial fluid plasma that has escaped from a capillary to nourish adjacent tissues
lymph that portion of the interstitial fluid that is returning to the bloodstream via lymphatic vessels rather than veins
leukocyte also known as a white blood cell (WBC), a cell that fights disease and infection
lymphocyte a type of white blood cell important for fighting viruses and cancers and for creating antibodies
antibody a protein that can bind to a specific antigen so that the immune system can remove it more easily
antigen the ability to resist a harmful substance or pathogen
antibody binding the process by which an antibody identifies and attaches to a specific antigen
lymphatic vessel part of a network of tubes that forms part of the circulatory system, returning lymph to the bloodstream
lymphoid tissues and organs the tissues and organs that work with the immune system to defend the body, including the thymus, bone marrow, lymph nodes, spleen, tonsils, adenoids, and other structures
primary lymphoid tissue the lymphoid tissues responsible for the creation and maturation of leukocytes and consisting of the bone marrow and thymus
secondary lymphoid tissue the lymphoid tissues that form the front lines of the immune system, encountering and processing the dangers, and consisting of the lymph nodes, spleen, tonsils, and adenoids
bone marrow a spongy tissue found in the hollow portion of long bones, where blood cell production occurs
thymus an organ made of lymphoid tissue that is specialized to prepare certain new lymphocytes that were created in the bone marrow to do their job
lymph node a grape-size oval organ made of lymphoid tissue that filters lymph to clean it of foreign material, pathogens, and cancer cells
spleen an organ in the left upper abdomen that serves to filter blood, stores a reserve of red blood cells, and functions like a large lymph node
adenoid small lymphoid organ in the pharynx that serves as a first line of defense against inhaled or ingested pathogens
tonsil small paired lymphoid organs in the pharynx that serves as a first line of defense against inhaled or ingested pathogens
innate immunity the immune capabilities present at birth, including all the nonspecific ways of responding to immune challenges
acquired immunity also known as adaptive immunity, the immune capabilities that are developed over a lifetime of experience with foreign antigens
immunological memory the body’s ability to remember foreign antigens that have affected the body, helping the immune system quickly remove these substances if subsequent invasions occur
cell-mediated immunity all the immune system responses that do not involve antibodies
inflammation an immune response to injury characterized by increased blood flow, redness, warmth, swelling, and pain
immune cells the smallest functional units working toward protecting the body from infection and harmful substances and including leukocytes and lymphocytes
granulocyte a type of white blood cell that contains granules of chemicals that are used to fight threats, such as pathogens
basophil a type of granulocyte that can release chemicals at the site of infection, causing an increase in blood flow and the attraction of other white blood cells
eosinophil a type of granulocyte that contains proteins that help with communication between various parts of the immune system
neutrophil a type of granulocyte that has mobility and can move from the blood vessels to sites of infection
phagocytosis the process of engulfing foreign material or pathogens that is used by certain white blood cells to rid them from the body
monocyte a type of white blood cell that is capable of phagocytosis
phagocyte a type of white blood cell that is capable of ingesting and destroying harmful substances and pathogens.
macrophage a specialized type of monocyte that has the ability to phagocytize
dendritic cell a type of specialized monocyte that has the ability to phagocytize
T-lymphocyte a lymphocyte that has matured in the thymus and is capable of recognizing foreign (“nonself”) cells or proteins and helping initiate their destruction
helper T-cell a type of T-cell that helps other lymphocytes do their jobs
cytotoxic T-cell a type of T-cell that can kill cells infected with a virus or affected by cancer
memory T-cell a type of T-cell that maintains the immunologic memory that can promote a more rapid immune response to future challenges
B-lymphocyte a lymphocyte that specializes in the production of antibodies
plasma cell an antibody-producing B-cell
memory B-cell a lymphocyte that maintains the immunologic memory important for achieving a more rapid antibody response in the future
Created by: rleroux