1. THE HEALING PROCESS- begins almost immediately
TISSUE REPAIR
THE HEALING PROCESS- begins almost immediately

2. 2 Ways of healing
1. Regeneration- replacement of old tissue by the same types of cells
2. Fibrosis- repair by dense fibrous tissue (scarring)

3. Tissue Injury sets a series of events into motion
Capillaries become extremely permeable- fluids rich in clotting proteins are allowed to seep into the injured area.
In deep tissue injuries swelling occurs (EDEMA) in the areolar tissue in the area.
Clotting proteins “wall off” the injured area preventing bacteria and harmful substances to enter.
If clot is exposed to air a SCAB will form.

4. Tissue Injury sets a series of events into motion
2. Granulation tissue forms- (delicate pink tissue that contains mostly new capillaries)- grows into the damaged area from nearby undamaged blood vessels. Contains phagocytes that will eat away scab.

5. Tissue Injury sets a series of events into motion
3. Surface epithelium regenerates- makes its way across granulation tissue just beneath the scab. Scab eventually falls off.

6. Ability of tissue to regenerate
Epithelial tissue- regenerates quickly and easily
Connective Tissue
Cartilage- will regenerate but takes some time (weeks)
Bone- will regenerate but takes more time (makes cartilage patch first)

7. Ability of tissue to regenerate
NERVOUS TISSUE- doesn’t regenerate- becomes only scar tissue
MUSCLE TISSUE- regenerates poorly- becomes mostly scar tissue (Examples torn muscles, injured cardiac tissue)