Chapter 11-Properties of the Hair & Scalp Flashcards
Scientific study of hair and its diseases and care is called
Trichology
The hair, skin nails and glass are apart of the
Integumentary System
The _______ is the pat of the hair located below the surface of the epidermis
Hair root
The _______ is the portion of the hair that projects above the epidermis
Hair Shaft
Tube-like depression or pocket in the skin or scalp that contains the hair root
Hair Follicle
Lowest part of the hair strand. it is the thickens, club-shaped structure that forms the lower part of the hair root
Hair Bulb
____________ is a small, cone shaped elevation located at the base of the hair follicle that fits into the hat bulb
Dermal Papilla
____________ is the small, involuntary muscle in the base of the hair follicle
Arrector Pili Muscle
The __________ glands secrete a fatty or an oily substance called sebum
sebaceous
You body can produce ___ of the 20 amino acids that make up hair, but your daily diet must include food to supply the remaining __ essential amino acids that the hair and scalp need.
11
9
The outermost layer of the hair
hair cuticle
Responsible for creating the shine and the smooth silky feel of healthy hair
Hair cuticle
A lengthwise ________ of hair shows that although the hair cuticle scales overlap, each individual cuticle scale is attached to the _______.
cross-section
cortex
a healthy hair cuticle layer protects the hair from what and prevents what
penetration
damage to hair fibers
middle layer of hair that is a fibrous protein core formed by elongated cells containing melanin pigment
cortex
changes involved in oxidation hair coloring, wet setting, thermal styling, per image waving and chemical hair relaxing take place within the _______
Cortex
_____ is composed of protein that grows from cells originating within the hair _______.
Hair Follicle
Keratinization
maturing process
the hair shaft that emerges is a _________ fiber composed of _________ protein
nonliving
keratinized
Hair is approximately what percent protein
90%
major elements that makeup human hair are
Carbon, oxygen, hydrogen nitrogen and sulfur
often referred to as the COHNS elements
proteins are made of long chains of __________, units that are joined together end to end like pop beads
amino acids
the strong, chemical bond that joins amino acids is a ____________, also known as end bond
peptide bond
A long chain of amino acids linked by peoetide bonds is called a __________
polypeptide chain
______ are long, coiled complex polypeptides made of amino acid
proteins
3 types of side binds
Hydrogen, Salt and Disulfide Bonds
weak, physical, cross-link side bond that is easily broken by water or heat
Hydrogen
how are hydrogen bonds broken
by setting the hair with water
when do the hydrogen bonds reform?
when the hair dries
weak, physical, cross-link side bond between adjacent polypeptide chains
Salt Bond
not broken by water but are broken by the permanent waves and chemical hair relaxers that alter the shape of hair
Disulfide Bonds
hydroxide chemical hair relaxers break disulfide bonds and then convert them to _____________ bonds
Lanthionine