Week 3 - Inflammation and repair Flashcards
Acute inflammation usually lasts ___ hrs
0-72 hrs
During acute inflammatory stage, is there vasodilation or vasoconstriction first?
vasoconstriction (5-10 minutes) –> vasodilation (hours-days)
When does the clotting cascade begin?
During the acute inflammatory stage (0-72 hrs)
Define exudate
Fluid that leaks out of blood vessels into nearby tissues
What happens during the clotting cascade?
- Blood leaking from injury after vasoconstriction helps form a clot
- Exudate is rich in cells for healing
- Prevents further bleeding and infection
- Stimulates healing process
The role of white blood cells in healing…?
- clean the wound
- Increase vascular permeability
- Promotes fibroblast activity (synthesise extracellular matrix and collagen)
Vasodilation is promoted by various ____________ systems associated with the increased flow into the affected region
plasma cascade systems
Inflammation is tissue _____
pressurised
Reparation/Proliferation stage is from _____ to ____?
72 hrs to 6 weeks
During the reparation/proliferation stage, what is occuring?
- Proliferation of capillaries
- Fibroblasts synthesise collagens and proteoglycans
- Collagen type III, gradually increasing type I synthesis
- Scar tissue: increase collagen III
Remodelling phase last from ___ to ____
6 weeks to months
What occurs during the remodelling phase?
- Restructuring of the tissue
- Differentiation to tissue specific cells
- Mechanical load -> gradual re-organisation of the tissue
In bone healing, the inflammatory response is….?
the formation of haematoma and granulation tissues
In bone healing, the reparation/proliferation phase is….?
- Callus formation
- cartilaginous and chondriod tissue
- Ossification of callus
- Hardening of callus consisting primarily of woven bone
In bone healing, the remodelling phase is….?
- woven bone (more space in bone -> like aero bar) is gradually replaced by lamellar bone (mature bone)
What are 3 types of cartilage articular damage?
- Loss of cartilage matrix molecules
- Isolated damage (chondral fracture)
- Injury to the cartilage and its underlying bone (osteocondral fracture)