CME CME Hair & Skin Science 1

Question 1

Which phase of the hair growth cycle is considered the active growth phase during which electrolysis is most effective?

Accepted Answer

Anagen

Answer

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?

Accepted Answer

15–20%

Answer

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?

Accepted Answer

Dermis

Answer

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:

Accepted Answer

Fine, short, and lightly pigmented

Answer

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?

Accepted Answer

Melanocytes

Answer

Melanocytes in the hair bulb produce and transfer melanin granules to keratinocytes, giving hair its color.

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