Anatomy & SciencesQuestion 441 of 484
Which list correctly orders the three phases of the hair growth cycle, from longest to shortest?
a.Catagen, telogen, anagen
b.Telogen, anagen, catagen
c.Anagen (active growth, 2 to 6 years on the scalp), telogen (resting, about 2 to 4 months), catagen (transition, about 2 to 3 weeks)
d.Anagen, catagen, telogen, all equal in length
Explanation
Hair grows in a repeating cycle of three phases. Anagen is by far the longest, lasting 2 to 6 years for scalp hair and defining the maximum length a person can grow. Telogen is the resting and shedding phase, lasting roughly 2 to 4 months, during which the hair sits in the follicle until pushed out by a new anagen hair. Catagen is the brief transitional phase, lasting only about 2 to 3 weeks, in which the follicle prepares to regress. Knowing the durations supports honest consultation about hair loss and growth expectations under the licensee's general competence duties at Bus. & Prof. Code §7320. Options A, B, and D misorder or equalize the phases.
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