CHS Anatomy of Skin & Hair 3

Question 1

What is the innermost layer of the hair shaft called?

Accepted Answer

Medulla

Answer

The medulla is the central core of the hair shaft, composed of loosely arranged cells and air spaces, and may be absent in fine hair.

Question 2

Which cells in the epidermis produce the pigment that protects against UV radiation?

Accepted Answer

Melanocytes

Answer

Melanocytes in the basal layer of the epidermis synthesize melanin and transfer it to surrounding keratinocytes to protect DNA from UV damage.

Question 3

What is the technical term for the visible part of the hair above the skin surface?

Accepted Answer

Hair shaft

Answer

The hair shaft is the portion of the hair that extends above the skin surface and is composed of the cuticle, cortex, and sometimes the medulla.

Question 4

The stratum granulosum layer of the epidermis is notable for containing which substance?

Accepted Answer

Keratohyalin granules

Answer

The stratum granulosum contains keratohyalin granules that play a critical role in the keratinization process as cells flatten and move toward the skin surface.

Question 5

During the catagen phase, what happens to the hair follicle?

Accepted Answer

The follicle shrinks and detaches from the dermal papilla

Answer

During catagen (transitional phase lasting ~2–3 weeks), the follicle regresses, cell division stops, and the lower follicle detaches from the dermal papilla.

(CHS) Certified Hair Stylist Practice Test

(CHS) Certified Hair Stylist Practice Test

CHS Anatomy of Skin & Hair 3