Texas Class A Barber Written ExamAnatomy and PhysiologyHard
A barber is evaluating a client's hair and notices an unusual amount of hair in the 'club hair' stage, indicating a significant number of follicles are prematurely entering the resting phase. This observation suggests a disruption in the normal hair growth cycle, specifically an acceleration of the transition from:
- AAnagen to Catagen.
- BAnagen to Telogen.
- CCatagen to Telogen.
- DTelogen to Anagen.
Show answer & explanationAnswer & explanation
Correct answer: A. Anagen to Catagen.
A 'club hair' forms at the end of the anagen (growth) phase, as the follicle shrinks and detaches from the dermal papilla, signaling the start of the catagen (transition) phase. Therefore, an unusual amount of club hair suggests an acceleration of the transition from the anagen phase to the catagen phase, leading to premature cessation of growth.
Why the other options are wrong
- B. While anagen to telogen is generally the overarching cycle, the specific phase where the club hair *forms* due to follicle regression is catagen, making the anagen to catagen transition the most direct answer for accelerated club hair formation.
- C. Catagen to Telogen is the transition from regression to resting; while club hairs are present in telogen, their formation is initiated by the shift *into* catagen.
- D. Telogen to Anagen is the initiation of new growth, which would reduce, not increase, club hairs.
Club Hair & Hair Cycle
A club hair is a hair that has ceased active growth (anagen) and is preparing to shed. Its formation marks the transition from the anagen phase to the catagen (regressing) phase of the hair growth cycle.
- Anagen: active growth (2-7 years).
- Catagen: transitional phase, follicle shrinks, club hair forms (2-3 weeks).
- Telogen: resting phase, old hair sheds (2-4 months).
- Club hairs are found in catagen and telogen.
Memory trick: Anagen's active, Catagen's club, Telogen takes a tranquil trip.