CLT Wound Healing & Tissue Repair

Question 1

What are the four primary phases of wound healing in the correct sequential order?

Accepted Answer

Hemostasis, inflammation, proliferation, remodeling

Answer

Wound healing occurs in four sequential phases: hemostasis (clotting), inflammation (immune response), proliferation (tissue building), and remodeling (scar maturation).

Question 2

Which photoacceptor in cells is primarily responsible for absorbing red and near-infrared light to promote wound healing?

Accepted Answer

Cytochrome c oxidase

Answer

Cytochrome c oxidase in the mitochondrial respiratory chain is the primary photoacceptor for red and near-infrared light, triggering increased ATP production that supports wound healing.

Question 3

During which phase of wound healing does collagen synthesis by fibroblasts primarily occur?

Accepted Answer

Proliferative phase

Answer

The proliferative phase is characterized by fibroblast activity, collagen synthesis, angiogenesis, and granulation tissue formation to fill the wound.

Question 4

What wavelength range is most commonly used in photobiomodulation for promoting wound healing?

Accepted Answer

600–1100 nm (red to near-infrared)

Answer

The therapeutic window of 600–1100 nm (red to near-infrared) is most effective for wound healing because these wavelengths penetrate tissue and stimulate cellular repair mechanisms.

Question 5

Which growth factor, upregulated by light therapy, plays a key role in angiogenesis during wound healing?

Accepted Answer

Vascular endothelial growth factor (VEGF)

Answer

VEGF is a primary mediator of angiogenesis (new blood vessel formation), and photobiomodulation has been shown to upregulate VEGF expression, enhancing blood supply to healing wounds.

CLT - Certified Light Therapist Practice Test

CLT - Certified Light Therapist Practice Test

CLT Wound Healing & Tissue Repair