1
is the study of hair, including diseases and care.
What is trichology
The fatty or oily substance secreted by the sebaceous glands is .........................
What is sebum
The strong, chemical bonds that join amino acids are called ...................................
What is peptide bonds
The measurement of the number of individual hair strands on one square inch of the scalp is .............................
What is hair density
During which phase does the follicle canal shrink and detach from the dermal papilla?
What is Catagen
A strand of human hair has two parts: the ____ and ______.
What is hair root and hair shaft
is the outermost layer of the hair.
what is the hair cuticle.
Which type of melanin provides natural colors ranging from red and ginger to yellow and blond tones?
What is Pheomelanin
Compared to hair with high porosity, chemical services performed on hair with low porosity require ..............................
What is more alkaline solutions
The average growth of healthy scalp hair is ...............
What is .5 inch per month
What is hair follicle
is known as the hair pith or core
What is the medulla
As amino acids are linked by peptide bond, they form along chain called
What is polypeptide chain
Wet hair with normal elasticity will stretch up to ........................... of its original length and return to that length without breaking.
What is 30% to 50%
the difference between grey hair and black hair is
What is the lack of pigment
Hair follicles are not found on the ......................
What is soles of the feet and palms of the hands
During the ...................... phase, new hair is produced because new cells are actively manufactured in the hair follicle.
What is anagen
Hydrogen bond can be broken by
What is water or heat
long pigmented hair on the scalp and body
What is terminal hair
The ............................ is the small, involuntary muscle in the dermis that attaches to the hair follicle.
What is arrector pili muscle
The major elements knows as CHONS Elements that make up human hair are carbon, oxygen, hydrogen, and ..........................
What is nitrogen and sulfur
Hair texture is classified as ...............................
What is coarse, medium or fine
is short, fine unpigmented body hair often referred to as peach fuzz.
What is Vellus hair
refers to hair's ability to absorb moisture.
What is porosity