500
name 5 factors that impede healing
1: extent of injury
2: edema- increased pressure causes separation of tissue, inhibits neuromuscular control, and impedes nutrition
3: hemorrhage- same effects as edema
4: poor vascular supply
5: separation of tissue- excessive scarring
6: muscle spasm- traction of torn tissue, separates two ends, prevents approximation
7: keloids/hypertrophic scars- rate of collagen producion exceeds rate of collagen breakdown in maturation phase
8: infection- delay healing, cause excessive granulation tissue, frequently causes large, deformed scars
9: humidity, climate, oxygen tension
10-health, age and nutrition