Tissue healing

Question 1

Skeletal muscle structure

Answer 1

• Collegen
• Elastin
• Connective tissue

Question 2

Muscular structure properties

Answer 2

• Extensibility: Capacity to stretch to the normal resting length after contracting
• Excitability: Ability to respond or contract in response to chemical/electrical signals
• Elasticity: Ability to return to original resting length after a muscle has been stretched
• Contractibility: Ability to shorten causing movement of structures to which muscles are attached

Question 3

Strain Curve

Answer 3

Elastic region: Will return to original shape with given stress
Plastic region: Will not return to original shape with given stress

Question 4

Tissue deformity

Answer 4

Yield point: Plastic behaviours
Plastic region: Microscopic failure

Question 5

Soft tissue healing

Answer 5

May include - cellular pathology, cell necrosis, wound healing, inflammation

Question 6

Phases of tissue healing

Answer 6

1. Bleeding
2. Inflammation
3. Repair
4. Re modelling

Question 7

Bleeding phase

Answer 7

Stopping blood when an injury occurs
- Vasoconstriction: blood vessels narrow to ^ blood pressure
- Plug formation: Adherence of platelets into a plug
- Coagulation: Fibrin mesh is made from fibrinogen (acts as a glue)
A scab is formed

Question 8

Inflammation 1-5 days

Answer 8

Body’s attempt to heal itself from tissue damage
Acute - Initial response to harmful stimuli
Chronic - Follows acute

Question 9

Proliferation (repair) 3-21 days

Answer 9

-Fibroblasts migrate to the area from surrounding tissue within the first few days due to chemical mediation
- Capillaries re-establish blood flow
- O2 helps with collegen production (helps with scaring)

Question 10

Remodelling 14 days - 2 years

Answer 10

• Type 3 collegen is reabsorbed
• Type 1 is now more abundant
• Optimal loading is required for strength of collegen
• Scar tissue formation