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

The Arndt-Schulz law (biphasic dose response) states that low doses of light stimulate biological processes, moderate doses inhibit them, and very high doses can cause damage.

Question 2

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

Accepted Answer

Active malignancies within the treatment area

Answer

Light therapy is contraindicated over active cancer sites because photobiomodulation could potentially stimulate tumor cell growth and proliferation.

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

Red light (630–660 nm) is absorbed by cytochrome c oxidase, boosting mitochondrial ATP production, which provides the energy fibroblasts need for collagen synthesis and proliferation.

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 light (800–1000 nm) has lower absorption by chromophores like water and hemoglobin compared to visible red light, allowing it to penetrate deeper into tissues.

Question 5

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

Accepted Answer

The wound bed and surrounding perilesional tissue

Answer

Optimal wound healing with photobiomodulation requires treating both the wound bed (to stimulate repair cells) and the perilesional tissue (to improve circulation and tissue support from the edges).

CLT - Certified Light Therapist Practice Test

CLT - Certified Light Therapist Practice Test

CLT Wound Healing & Tissue Repair 2