INFLAMMATION Flashcards
- is a protective mechanism in that protective factor such as antibodies, complement and phagocytic cells normally confined to the bloodstream gain access at localized tissue sites to destroy foreign invaders.
inflammation
Leucocytes then begin to
appear in the marginal plasma
stream of the venule
margination
began to stick to
the walls and adhere to it for longer
periods
adherence
Progressively, more leucocytes
adhere to the walls until the luminal
surface of the wall become covered
with a layer of leucocytes
pavementing
phase lasting less than an hour,
immediate phase
phase that last for 3-4 hours or longer if the stimulus persists.
prolonged phase
phase that last for several days, although delayed in onset has been described to occur in sunburns.
third phase
in tissues is accomplished by pseudopodia into
the intercellular junction of endothelial cells, enlarging their opening and squeezing through.
migration
What attract the leucocytes to migrate to the injured site are,
chemical mediators
What attract the leucocytes to migrate to the injured site are chemical mediators of inflammation and this process is called
chemotaxis
commonly called polymorphs or granulocytes are usually first, and could move through fibrin and past tissue cells to their destination.
neutrophils & eosinophils
are chemical messengers that act on vascular endothelia and leucocytes to contribute to an inflammatory reaction.
autacoids
mediators coming from the outside
exogenous mediators
mediators synthesized by the body
endogenous mediators
coming from the three major mediator-
producing systems in the plasma as coagulation-fibrinolytic system, kinin system, and complement system
plasma derived
may be performed and stored as
granules in cells or newly synthesized by cells
Tissue derived
generated by consequent or multiple enzymic
steps involving sequential activation of molecules by limited proteolysis
Peptide mediators
– collectively called eicosanoids, these are derived
from the action of phospholipase to membrane phospholipids through the arachidonic acid pathways
lipid mediators
classical pathway start at
C4
alternate pathway start at
C3
Several mediators cause the observed
vasodilation and hyperemia in the early stages of inflammation.
histamine from mast cells & basophils
Effects of Autacoids
Vasodilation and Hyperemia.
Vasopermeability.
Leucocyte Emigration and Chemotaxis.
type of exudates that is a clear fluid that is low in protein that exudes from serosal or mucosal surfaces following mild irritation. Ex. Runny nose seen in many
inflammatory reactions, and should neutrophils be present, it imparts a whitish tinge to the exudates.
serous exudate
type of exudate exudates usually occur in severe vascular injuries where a fluid rich in fibrinogen is produced. most notably in the intestines, pleura, peritoneum, and synovial
membranes.
Fibrinous exudate