CME CME Hair & Skin Science 1 — Questions and Answers
Question 1: Which phase of the hair growth cycle is considered the active growth phase during which electrolysis is most effective?
- Catagen
- Telogen
- Anagen (Correct answer)
- Exogen
Correct answer: Anagen
Anagen is the active growth phase when the hair is attached to the dermal papilla, making electrolysis most effective.
Question 2: What is the approximate percentage of scalp hairs in the telogen phase at any given time?
- 5–10%
- 10–15%
- 15–20% (Correct answer)
- 25–30%
Correct answer: 15–20%
Approximately 15–20% of scalp hairs are in the telogen (resting) phase at any given time.
Question 3: Which skin layer contains the dermal papilla that nourishes the hair follicle?
- Epidermis
- Hypodermis
- Dermis (Correct answer)
- Stratum corneum
Correct answer: Dermis
The dermal papilla sits at the base of the follicle within the dermis, supplying nutrients via blood vessels.
Question 4: Vellus hairs differ from terminal hairs primarily in that they are:
- Deeply pigmented and coarse
- Fine, short, and lightly pigmented (Correct answer)
- Found only on the scalp
- Produced by apocrine glands
Correct answer: Fine, short, and lightly pigmented
Vellus hairs are fine, short, and lightly pigmented, whereas terminal hairs are coarser and darker.
Question 5: Which cell type in the hair bulb is responsible for producing hair pigment?
- Keratinocytes
- Melanocytes (Correct answer)
- Fibroblasts
- Langerhans cells
Correct answer: Melanocytes
Melanocytes in the hair bulb produce and transfer melanin granules to keratinocytes, giving hair its color.
Question 6: The sebaceous gland opens into the:
- Sweat duct
- Hair follicle (Correct answer)
- Dermis directly
- Epidermis surface
Correct answer: Hair follicle
Sebaceous glands open into the hair follicle, secreting sebum that lubricates both the hair and surrounding skin.
CME CME Hair & Skin Science 1
Which phase of the hair growth cycle is considered the active growth phase during which electrolysis is most effective?