Properties of the Hair and Scalp

All of the following are living portions of hair that are below the skin surface EXCEPT ______

• the hair bulb

• the arrector pili muscle

• the hair follicle

• the dermal papilla

Each of the following is a layer of the hair shaft structure EXCEPT ______

• the cortex

• the hair fiber

• the hair cuticle

• the medulla

Which portion of the hair root structure supplies nutrients so the hair can grow?

• the hair bulb

• the dermal papilla

• the arrector pili

• the hair follicle

Which sentence best describes the medulla?

• The medulla is the hair's outermost layer.

• The medulla is a cone-shaped elevation at the base of the hair bulb.

• The medulla is the hair's pith or core.

• The medulla is the fibrous protein layer of the hair.

Which layer of the hair shaft provides strength, elasicity, and color?

• the hair cuticle

• the hair fiber

• the medulla

• the cortex

What are the major chemical elements that make up human hair?

• carbon, oxygen, hydrogen, nitrogen, and sulfur

• proteins, water, lipids, and traces of minerals

• amino acids and polypeptide chains

• hydrogen bonds, side bonds, and salt bonds

Which of the following is a situation in which a cosmetologist would allow the hair to cool before styling?

• when salt bonds are being formed by changes in pH during chemical servicing

• when hydrogen side bonds have been broken by the heat of a curling iron

• when peptide bonds between amino acids are broken by a heat lamp during color processing

• when disulfide bonds are converted to lanthionine bonds during servicing with a flat iron

What is the outermost layer of hair?

• hair follicle

• hair medulla

• hair cuticle

• hair cortex

If a cosmetologist holds a strand of hair with one hand while sliding the other hand's thumb and forefinger from the end of the strand to the client's scalp, what component of the hair is being analyzed?

• porosity

• elasticity

• density

• texture

Which component of hair is defined as the thickness or diameter of an individual hair strand?

• porosity

• elasticity

• texture

• density