CLT Wound Healing & Tissue Repair 2

Question 1

The Arndt-Schulz law as applied to photobiomodulation states that:

Accepted Answer

Low doses stimulate, moderate doses inhibit, and very high doses destroy

Answer

Higher doses always produce better therapeutic outcomes

Answer

Light therapy is only effective when applied continuously

Answer

Wavelength determines effectiveness more than dose

Question 2

Light therapy is generally CONTRAINDICATED when applied over which of the following?

Accepted Answer

Active malignancies within the treatment area

Answer

Diabetic foot ulcers

Answer

Pressure ulcers

Answer

Post-surgical wounds

Question 3

What is the primary mechanism by which 630–660 nm red light promotes fibroblast activity in wound healing?

Accepted Answer

Photon absorption by cytochrome c oxidase increasing ATP and cellular metabolism

Answer

Direct destruction of bacteria in the wound

Answer

Thermal heating that activates heat-shock proteins

Answer

Ultraviolet induction of vitamin D synthesis

Question 4

Near-infrared light (800–1000 nm) penetrates deeper than red light primarily because:

Accepted Answer

NIR has lower absorption by water and hemoglobin, allowing deeper penetration

Answer

NIR has higher photon energy

Answer

NIR triggers melanin production which guides light downward

Answer

NIR wavelengths are reflected by the stratum corneum

Question 5

When applying photobiomodulation to a wound, the recommended treatment area should include:

Accepted Answer

The wound bed and surrounding perilesional tissue

Answer

The wound edges only, not the center

Answer

Surrounding healthy tissue only

Answer

Only the area with the deepest tissue involvement

Question 6

Which of the following best describes the concept of 'fluence' in photobiomodulation wound treatment?

Accepted Answer

The total energy delivered per unit area, measured in J/cm²

Answer

The color of light used for a given treatment

Answer

The rate at which photons are delivered per unit area per second

Answer

The distance between the light source and wound

Question 7

Photodynamic therapy (PDT) reduces biofilm formation in chronic wounds primarily through which mechanism?

Accepted Answer

Photosensitizer activation generating reactive oxygen species that destroy bacteria

Answer

Thermal destruction of the biofilm matrix

Answer

UV-induced sterilization of the wound surface

Answer

Mechanical disruption via light pressure