332A Hair Science and Structure 5

Question 1

What percentage of scalp hair is typically in the anagen phase at any given time?

Accepted Answer

85-90%

Answer

Approximately 85-90% of scalp hair is in the anagen (active growth) phase at any given time, which is why most of the hair on your head is actively growing.

Question 2

What is the effect of acidic products on the hair cuticle?

Accepted Answer

They close and harden the cuticle

Answer

Acidic products (pH below 7) cause the cuticle to contract, close, and harden. This is why acidic rinses and conditioners make hair feel smoother and shinier.

Question 3

What is vellus hair?

Accepted Answer

Short, fine, unpigmented body hair

Answer

Vellus hair is the short, fine, nearly colourless hair that covers most of the body. It differs from terminal hair, which is thicker, longer, and pigmented.

Question 4

Salt bonds in hair are broken by changes in what?

Accepted Answer

pH

Answer

Salt bonds (also called ionic bonds) are broken by changes in pH. They are weak electrostatic bonds between positive and negative amino acid side chains in the cortex.

Question 5

What is hair density?

Accepted Answer

The number of individual hair strands per area of the scalp

Answer

Hair density refers to the number of individual hair strands per square centimetre on the scalp. It is classified as thin (low density), medium, or thick (high density).

Red Seal Hairstylist 332A Practice Test

Red Seal Hairstylist 332A Practice Test

332A Hair Science and Structure 5