lymphatic system

lymph

A clear fluid that circulates through the lymphatic system, containing white blood cells and other substances. It plays a vital role in immune function and lipid absorption.

lymph node

Small, bean-shaped structures that filter lymph and are integral to the immune system, housing lymphocytes and other immune cells.

lymphatic functions

The various roles of the lymphatic system, including the transport of lymph, the filtering of pathogens, and the absorption of fats from the digestive system.

lymph vessles

Tube-like structures that carry lymph throughout the body, facilitating its transport to lymph nodes and eventually to the bloodstream.

lymphatic organs

thymus and spleen

MALT

Mucosa-associated lymphoid tissue, which includes lymphoid tissues found in mucosal sites like the gut and respiratory tract. such as tonsils,peyers patches and appendix

thymus

active during childhood-gains reconition of foregn invaders

spleen

behind stomach-destroys wornout red blood cells

tonsils

in throat area-small lymphoid tissue traps bacteria

appendix

end of large intestine-”safe house theory”

lymphatic relation to the circulatory system

nonspecific body defenses

innate immunity,protects against variety of invaders,responds immeditly

timeline of nonspecific

0-12 days

first line of defense

skin,mucous membranes,secretions of skin and

second line of defense

phagocytic cells, the inflamitory response, antimicrobial protiens

skin

acid mantal for skin and sweat inhibits bacteria growth, physical nunction:tight junction, keritin and sebum

mucous membranes

mucous in respitory tract, nasal hairs in nose, cilia in tracea, gastric juice-hydrochloric acid and saliva and tears-lysosome

cells

basophil,nuetrophil,eosiniphil,mast cell, natrul killer cell, and macrophage,dendritic cell(both)

phagocytic cells

nuetrophil,dendritic,eosiniphil,macrophage/monocyte

phagocytosis

engulf foregin thing and lysosome destroys it

nuetrophil

most abundent, can life one to two days in tissue and realseses antimicrobal

monocyte/macrophage

enter lymph nodes, can live for years and present antigens to T-cells

dendritic cells

messenger cell

eiodiniphil

imune response and destoys large parasites

basophils

least abundant and releases histamine

mast cell

allergic responses and realeses hsitomine

NK cells

• A type of lymphocyte associated with nonspecific (innate) immunity and perfoins

lysis and apoptosiss

cell death. perfoins innante the cell death

• Antimicrobial Proteins

• Prevent pathogen reproduction

• Attract WBCs to the site of infection

vasodilators

• Vasodilators such as histamine and serotonin cause blood vessels to dilate bringing more WBCs into the area

• Interferon

• A protein secreted by virus-infected cells that mobilizes the immune system and protects uninfected cells from viral takeover

• Pyrogens

• A group of chemicals produced by pathogens that activate WBCs to to cause fever