332A Hair Science and Structure

Question 1

Which layer of the hair shaft is responsible for the hair's strength and elasticity?

Accepted Answer

Cortex

Answer

The cortex makes up the majority of the hair shaft and contains the fibrous proteins (keratin) that give hair its strength, elasticity, and colour.

Question 2

What is the primary protein that makes up human hair?

Accepted Answer

Keratin

Answer

Keratin is a tough, fibrous protein that is the primary structural component of hair, nails, and the outer layer of skin.

Question 3

Which type of melanin produces red and yellow hair colours?

Accepted Answer

Pheomelanin

Answer

Pheomelanin is the pigment responsible for red and yellow tones in hair. Eumelanin produces brown and black colours.

Question 4

What chemical bond in hair is broken by water and heat and reforms when hair dries or cools?

Accepted Answer

Hydrogen bond

Answer

Hydrogen bonds are weak physical bonds that are easily broken by water and heat. They are responsible for temporary styling changes like blow-drying and curling.

Question 5

During which phase of the hair growth cycle does the hair actively grow?

Accepted Answer

Anagen phase

Answer

The anagen phase is the active growth phase of hair follicles, lasting 2 to 7 years. Approximately 85-90% of scalp hairs are in this phase at any time.

Red Seal Hairstylist 332A Practice Test

Red Seal Hairstylist 332A Practice Test

332A Hair Science and Structure