Elements of the Hair
What is the outermost layer of hair.
hair cuticle
What type of hair has the largest diameter?
coarse hair
What are major chemical elements that make up human hair?
(Otherwise known as COHNS)
Carbon, Oxygen, hydrogen, nitrogen, sulfur.
In this hair cycle, the follicle shrinks and detaches from the dermal papilla.
catagen
Hair is approximately ____ percent protein
90
What is a layer of the hair shaft structure?
hair fiber
Which layer of the hair shaft provides strength, elasticity, and color?
cortex
A long chain of amino acids linked by peptide bonds is called a _______ chain.
Hint: polly-pocket
polypeptide
What is not one of the hair types of body hair
-anagen, vellus, terminal, lanugo
anagen hair
The hair, skin, nails, and glands are part of the ___ system.
integumentary
What portion of the hair root provides nutrients so that the hair can grow?
the dermal papilla
What are the two parts of a strand of human hair?
root and shaft
What are three different types of side bonds that link chains of amino acids together?
hydrogen, salt, and disulfide
In this hair growth cycle the hair can shed.
telogen phase
True or False:
Hair growth rate is determined by genetics.
True
Which component of hair is defined as the thickness or diameter of an individual hair strand?
texture
What can be a cause of dry hair and scalp?
inactive sebaceous glands
What is the medulla?
the hairs pith or core
What are three growth cycles of human hair?
anagen catagen, telogen
True or False: Shaving can cause hair to grow back thicker and darker.
False
Which of these is a living portion of the hair that is not below the skin surface.
-hair bulb, the arrector pili muscle, hair follicle, or dermal papilla
arrector pili muscle
If a cosmetologist holds a strand of hair 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
How does a disulfide bond form in human hair?
Sulfur atoms on neighboring cysteine amino acids within polypeptide chains in the hair join.
What is the growth phase during which new hair is produced?
anagen
What did Madem C.J Walker?
“the first Black woman millionaire in America” and made her fortune thanks to her homemade line of hair care products for Black women