Exam 3 (1-10) Flashcards
Functions of lymphatic system
- Collects interstitial fluid and returns it to the boodstream to prevent edema
- Filters lymph through lumph nodes to remove pathogens and debris
- Transports proteins and largemolecules back into the bloodstream.
Lymph
Clear fluid rich in lymphocytes, involved in immune response
Lymphatic vessels
Transport lymph throughout the body
Lymph nodes
Filter lymph and trap pathogens
* Cortex: Outer part; rich in B-Cells and follicular denritic cells.
* Medulla: Inner part; contains lymphocytes, plasma cells, and macrophages.
Spleen
Filters blood, removes old RBC’s, and stores WBC’s and platelets.
Thymus
Site of T-cell maturation, critical in adaptive immune response, and decresses in function after puberty
Tonsils
First line of defense against ingested or inhaled pathogens
* Lingual, pharyngeal, palatine
Lymphatic System immunity functions
- Houses and transports lymphocytes (B + T cells)
- lymph nodes and lymphatic tissues activate immune responses by detecting antigens in lymph
- Macrophages and dendritic cells engulf pathogens in lymph nodes.
Innate immunity
- Non-specific, 1st line of defense (skin, mucous, membranes, macrophages), second line of defense (inflammation, fever, and phagocytosis).
- Rapid response
Adaptive immunity
- Specific defense against specific threats, involving T and B cells that provide long-term immunity through memory cells.
- Types Antibody (b cells) and cell (t cells) mediated immunity
Humoral Immunity
Mediated by B cells that produce antibodies to neutralize exracellular pathogens
Cell-mediated immunity
Involves T cells that directly attack infected cells, effective against intracellular pathogens like viruses.
Antigens
Unique molecules recognized by the immune system as either self or non-self
Haptens
Small molecules that trigger immune responses when combined with larger carrier proteins.
Cytokines
SIgnaling chemicals that regulate immune responses
