CLT Anatomy & Physiology for Laser Therapy 2 — Questions and Answers
Question 1: Which layer of the skin contains the fibroblasts primarily responsible for collagen synthesis targeted in laser therapy?
- Epidermis
- Dermis (Correct answer)
- Hypodermis
- Stratum corneum
Correct answer: Dermis
The dermis contains fibroblasts that produce collagen and elastin, making it the primary target for laser-stimulated tissue remodeling.
Question 2: What is the primary chromophore in melanin-targeting laser treatments?
- Oxyhemoglobin
- Deoxyhemoglobin
- Eumelanin (Correct answer)
- Water
Correct answer: Eumelanin
Eumelanin is the dominant brown-black pigment that selectively absorbs laser energy in pigment-targeting treatments.
Question 3: Which nerve fiber type is most involved in transmitting the pain signals that low-level laser therapy aims to modulate?
- A-alpha fibers
- A-beta fibers
- C fibers (Correct answer)
- B fibers
Correct answer: C fibers
C fibers are unmyelinated slow-conducting fibers that transmit chronic pain and are a key target for photobiomodulation analgesic effects.
Question 4: The Langerhans cells found in the epidermis primarily serve what function relevant to laser treatments?
- Melanin production
- Immune surveillance and antigen presentation (Correct answer)
- Keratin synthesis
- Sebum secretion
Correct answer: Immune surveillance and antigen presentation
Langerhans cells are dendritic immune cells in the epidermis that help modulate the inflammatory response triggered by laser energy.
Question 5: Which anatomical structure in a hair follicle is responsible for hair regeneration and is a consideration in laser hair removal?
- Arrector pili muscle
- Sebaceous gland
- Bulge region (Correct answer)
- Inner root sheath
Correct answer: Bulge region
The bulge region contains hair follicle stem cells responsible for regeneration, and effective laser hair removal must damage this area to prevent regrowth.
Question 6: In the context of laser therapy, what does the term 'optical window' of tissue refer to?
- The clear cornea of the eye
- The wavelength range (600–1100 nm) where tissue absorption is low enough for deep penetration (Correct answer)
- The transparent epidermis in albino skin
- The window of time after treatment for optimal healing
Correct answer: The wavelength range (600–1100 nm) where tissue absorption is low enough for deep penetration
The optical window (600–1100 nm) is the spectral range where both melanin and water absorption are relatively low, allowing laser light to penetrate deeper tissues.
Question 7: Which type of sweat gland is most relevant to understanding laser treatment near axillary regions?
- Eccrine glands
- Apocrine glands (Correct answer)
- Merocrine glands
- Holocrine glands
Correct answer: Apocrine glands
Apocrine sweat glands in the axillary region are associated with hair follicles and can be affected during laser hair removal or skin treatments in that area.
CLT Anatomy & Physiology for Laser Therapy 2
Which layer of the skin contains the fibroblasts primarily responsible for collagen synthesis targeted in laser therapy?