Hair & Scalp Properties Flashcards

What is the visible part of the hair that extends above the scalp surface called?

Answer: Hair shaft

The hair shaft is the portion of the hair that is visible above the surface of the scalp.

Traction alopecia is most commonly caused by:

Answer: Prolonged tension on the hair from tight hairstyles

Traction alopecia results from repeated or prolonged pulling on the hair, often from tight braids, ponytails, or extensions.

The medulla is the innermost layer of the hair shaft and is:

Answer: Absent or fragmented in fine hair

The medulla is a soft, honeycomb-like core that may be absent or fragmented in fine or vellus hair.

What is the primary function of the sebaceous glands in relation to hair?

Answer: Secreting sebum to lubricate and protect the hair and scalp

Sebaceous glands produce sebum, which lubricates the hair shaft and scalp, helping prevent dryness and providing some antimicrobial protection.

Which hair growth phase is the longest, during which active growth occurs?

Answer: Anagen

The anagen phase is the active growth phase, lasting 2 to 7 years, during which the hair grows approximately 1/2 inch per month.

Salt bonds in hair are broken and reformed by changes in:

Answer: pH levels

Salt bonds are ionic bonds that are easily broken by changes in pH (acids or alkalis) and reform when the pH is normalized.

A cosmetologist notices a client has circular patches of hair loss with no scarring or inflammation. This most likely indicates:

Answer: Alopecia areata

Alopecia areata is an autoimmune condition presenting as sudden, circular patches of hair loss on an otherwise normal-looking scalp.