Hair root
What is the hair root?
living portion of hair below the skin
Which layer is the outer protective layer that creates shine and gives hair it's silky smooth hair?
cuticle
Hair skin and nails are part of which system?
Integumentary system
The ability of the hair to absorb moisture?
porosity
What causes dry hair and scalp?
inactive sebaceous glands
What are the 3 main types of body hair?
terminal, lanugo, vellus
What is the technical term for hair loss?
alopecia
What disorder causes terminal hair to grow on areas of a women's body where hair doesn't typically grow?
hirsuties
The tube-like structure, surrounds the root and anchors the hair in the skin?
Hair follicle
Which layer is the middle and largest layer that provides strength elasticity and color. All chemical changes take place in this layer and it is responsible for 90% of the total weight of the hair.
the cortex
Name the COHNS elements?
Carbon, Oxygen, Hydrogen, Nitrogen, Sulfur
What is the diameter of each individual hair strand called?
texture
What is it called when the strands of hair leave the follicles at a different angle from the surrounding hair?
a whorl
In which phase of growth does the follicle cancel shrink and detach from the dermal papilla?
Catagen
Which type of alopecia is defined as hair loss in round or irregular patches and is caused by an autoimmune disorder?
alopecia areata
What is the technical term for beaded hair?
monilethrix
What part of the root is club shaped and contains living cells?
Hair bulb
Which layer is known as the pith or core of the hair. This layer may be absent in very fine hair.
Medulla
What is the process by which new cells mature, fill up with protein, move upward, lose their nucleus and die called?
keratinization
This texture has the smallest diameter and processes faster?
fine textured hair
Why might a person not be able to grow extremely long hair?
they may have a shorter anagen phase
What are 3 causes of hair loss?
pregnancy, insufficient diet, autoimmune disorders
What is congenital canitites?
it is present at birth, lack of pigment
What is the cone-shaped elevation at the base of the bulb that contains blood vessels that supply nutrients that allow hair to grow?
Dermal papilla
Hair is __________% protein?
90
This is the most common hair texture, it does not cause any problems or concerns?
medium texture
Name the 3 growth cycles of human hair?
anagen, catagen, telogen
When does alopecia areata typically begin?
in childhood
Name 3 forms of brittle hair?
trichorrhexis nodosa, monilethrix, fragilitas crinium
What secretes sebum to lubricate hair and skin?
sebaceous glands
What links amino acids together?
Peptide bond also known as end bond
Which type of hair has the largest diameter and requires the longest processing time?
coarse hair
Which phase is known as the growth phase where new hair is produced?
anagen
Complete loss of all body hair is known as?
alopecia universalis
How do you treat trichorrhexis nodosa?
soften with conditioner
This is the weakest side bond, easily broken by heat or water, reforms when wet?
Hydrogen bond
Temporary hair loss at the end of pregnancy?
postpartum alopecia
How can you repair split ends?
you can't it needs to be cut off
This bond is broken by changes in pH?
salt bond
What disorder is characterized by loss of natural pigment?
canities
This bond is broken by chemicals, it is the strongest of the side bonds?
Disulfide bond
What causes pityriasis?
fungus called malassezia
Hydroxide relaxers break disulfide bonds and convert them to a ___________________bond?
lanthionine bond
What is the technical term for head lice?
pediculosis capitis
A long chain of amino acids linked by a peptide bond is called a_________?
polypeptide chain
What is scabies?
mites that lay eggs under the skin
What condition is characterized by brittleness and nodular swelling along the hair shaft?
trichorrhexis nodosa
This is a severe type of dandruff characterized by an accumulation of greasy waxy scalp scales mixed with sebum?
pityriasis steatoides
Which scalp disorder is characterized by dry sulfur yellow, cup-like crusts on the scalp?
tinea favosa