EC EC Hair Growth and Follicle Anatomy 1 — Questions and Answers
Question 1: Which phase of the hair growth cycle is the active growth phase during which electrolysis is most effective?
- Telogen
- Catagen
- Anagen (Correct answer)
- Exogen
Correct answer: Anagen
The anagen phase is the active growth phase when the hair follicle is most vulnerable to permanent destruction by electrolysis.
Question 2: What is the name of the innermost layer of the hair shaft?
- Cortex
- Cuticle
- Medulla (Correct answer)
- Matrix
Correct answer: Medulla
The medulla is the innermost layer of the hair shaft, though it may be absent in fine hair types.
Question 3: Which structure at the base of the hair follicle contains the actively dividing cells responsible for hair growth?
- Sebaceous gland
- Dermal papilla
- Hair bulb matrix (Correct answer)
- Arrector pili muscle
Correct answer: Hair bulb matrix
The hair bulb matrix contains the rapidly dividing keratinocytes that produce the hair shaft.
Question 4: During which hair growth phase does the follicle shrink and detach from the dermal papilla?
- Anagen
- Catagen (Correct answer)
- Telogen
- Kenogen
Correct answer: Catagen
The catagen phase is a transitional period during which the follicle regresses and the hair stops growing.
Question 5: What percentage of scalp hairs are typically in the telogen (resting) phase at any given time?
- 5–10%
- 15–20% (Correct answer)
- 30–40%
- 50–60%
Correct answer: 15–20%
Approximately 15–20% of scalp hairs are in the telogen resting phase at any given time.
Question 6: Which skin layer houses the hair follicle bulb and dermal papilla?
- Epidermis
- Hypodermis
- Dermis (Correct answer)
- Stratum corneum
Correct answer: Dermis
The dermis contains the hair follicle bulb and the dermal papilla, which supplies blood and nutrients for hair growth.
EC EC Hair Growth and Follicle Anatomy 1
Which phase of the hair growth cycle is the active growth phase during which electrolysis is most effective?