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

Medulla

Answer

Cuticle

Answer

Dermal papilla

Question 2

What is the primary protein that makes up human hair?

Accepted Answer

Keratin

Answer

Collagen

Answer

Elastin

Answer

Melanin

Question 3

Which type of melanin produces red and yellow hair colours?

Accepted Answer

Pheomelanin

Answer

Eumelanin

Answer

Trichosiderin

Answer

Neuromelanin

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

Disulfide bond

Answer

Salt bond

Answer

Peptide bond

Question 5

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

Accepted Answer

Anagen phase

Answer

Catagen phase

Answer

Telogen phase

Answer

Exogen phase

Question 6

What is the function of the arrector pili muscle attached to the hair follicle?

Accepted Answer

It causes goosebumps by contracting

Answer

It produces sebum

Answer

It supplies blood to the papilla

Answer

It anchors the cuticle layer