Hair & Scalp Properties Flashcards

What is the name for hair loss that follows the typical pattern of receding hairline and thinning crown in men?

Answer: Androgenetic alopecia

Androgenetic alopecia (male-pattern baldness) is caused by a genetic sensitivity to dihydrotestosterone (DHT) and follows predictable hair loss patterns.

A vellus hair is best described as:

Answer: A fine, soft, unpigmented hair covering most of the body

Vellus hair is the fine, soft, short, and usually unpigmented hair that covers most of the human body.

What does high porosity in hair indicate?

Answer: The hair cuticle is raised or damaged and absorbs moisture quickly

High porosity means the cuticle layer is open or damaged, causing hair to quickly absorb moisture but also lose it rapidly.

The hydrogen bonds in hair are broken by which of the following?

Answer: Water and heat

Hydrogen bonds are weak physical bonds easily broken by water or heat, which is why wet setting and thermal styling temporarily change hair shape.

Tinea capitis is a scalp condition caused by:

Answer: A fungal infection

Tinea capitis, commonly called ringworm of the scalp, is a fungal infection and is contagious.

Which type of hair bond is the strongest and most difficult to break?

Answer: Disulfide bond

Disulfide bonds are covalent bonds that are the strongest bonds in hair and can only be broken by chemical processes such as perms or relaxers.

What is the term for the number of individual hair strands per square inch on the scalp?

Answer: Density

Hair density refers to the number of hair strands per square inch and is classified as thin, medium, or thick.