Acute and chronic inflammation Flashcards
Name the causes of inflammation
Foreign bodies (splinter) Infections (bacterial/viral/fungal) Ischaemia/infarction (heart attack) Physical and chemical damage (acid burns) Immune reactions (asthma)
Define inflammation
The host response to tissue damage
Why does vasodilation occur in acute inflam?
To increase blood flow to injured area
What influences vasodilation?
Histamine and nitric acid
Increased permeability leads to what?
Oedema as fluids leaks into extravascular tissue
Vasodilation and increased permeability leads to…
Blood stasis
If endothelial cells become injured or contract this causes what?
Extravascular leakage
Define main aim of inflam
Recruit leukocytes to area of damage
Marigination =
Rbc in the middle wbc near the endothelial cells
Transmigration =
Wbc going into extravascular space
Opsonin receptors recognise…
Microbes that have been coated with protein
Cytokine receptors respond to…
Cytokines
G protein coupled receptors recognise…
N-formymethionyl of bacteria as well as chemokine breakdown
Aim of acute inflam…
To resolve injury and promote healing
Chronic inflam is caused by
Acute inflam (not as common) Persistent infection Immune mediated inflam (parasite/myobacteria) Prolonged exposure to toxic agen (atherosclerosis)