Hair Test 3&4 Flashcards
A club shaped structure at the bottom of the hair follicle that completely surrounds the papilla is the what
Hair bulb
A small cone-shaped piece of the dermis bulges up into the bottom of the hair follicle forming the what
Hair papilla
Oxygen, amino acids and nutrients needed for the production of hair reach the stem cells through the what
Papillary capillaries
The epidermis grows downward into the dermal tissue creating a pocket called the what
Hair follicle
Which saccular gland is attached to the side of the hair follicle
Sebaceous
The madulla layer of the hair has what..
Has no known function
The outermost layer of the hair is the
Cuticle
The layer of the hair that acts as an outside barrier is the what
Cuticle
The layer of the hair where most melanin is found
Cortex
Which type of hair does not always have three layers
Fine
What percentage of the weight of the hair does the cortex make up
75-90%
The portion of the hair above the skins surface
Hair shaft
Whenever a product with an alkaline pH is used it will increase the hairs what
Porosity
What layer of the hair is translucent and contains no melanin
Cuticle
What are the building blocks of all proteins
Amino acids
‘What’ is the chemical cross bond found in the hair
Cystine bond
‘What’ is the chemical bond that must be broken and reformed when doing a permanent wave or hair relaxer.
Cystine bond
What is the growth cycle of hair
Anagen
The average growth cycle of hair usually last
5-7 yrs
What is the short, very fine hair found on the body
Vellus
Shaving will cause the hair to grow at a faster rate.. T or F
False
Which type of hair would look the flattest when looking at a cross sectional view of it
Very curly
What is the average moisture content of dry hair
5-10%
Which type of melanin produces the black to brown shades
Eumelanin
Which color of the hair has the larger color molecules
Black
What refers to how many hairs grow in a square inch
Density
Which shade of hair has the lowest density.
Red
Which shade of hair usually has the highest density
Blonde
Healthy wet hair can be stretched up to what percent without damage
50%
The average head has approximately how many shafts of hair
100,000
Scalp hair grows faster on men than women.. T or F
False
Hair usually grows faster in the summertime
True
Added water can cause the hair to swell as much as
10
The special cells responsible for the production of melanin are called
Melanocytes
What has the highest percentage of all the elements found in the hair
Carbon
Hair usually has a what % content of the element sulfur
4-8%
Natural what tones of hair, usually have the highest content of the element sulfur
Red
During the anagen phase, new hair is produced from special cells called what cells
Stem
Is hair a living cell after the hair shaft pushes above the skins surface
No
In relation to other layers of the hair, the medulla layer has
No known function
The great strength of the hair is directly related to the nature of the
Cortex
An important function of the hair cuticle is to
Protect the cortex
Simple proteins are
Easily digested
Cross-links are formed by a unique amino acid called
Cystine
Fiber proteins are
Non-digestible
The hair follicle’s resting stage is called its
Telogen phase
Primary terminal hair is the short, thick hairs that grow on the what and what.
Eyebrows and eyelashes
White hair has no melanin or oxymelanin.. T or F
True
When two cystine amino acids link together they form a disulfide link between adjacent polypeptide chains known as a what bond
Cystine
Name the chemical cross bond that must be broken and reformed when doing a permanent wave or hair relaxer
Salt bond
Which shade of hair usually has about 90,000 hairs
Red
Which gland is attached to the side of the hair follicle
Sebaceous
The middle layer of the hair is know as the
Cortex
Name the small cone-shaped elevation of the dermis at the bottom of the hair follicle
Hair papilla
The portion of hair above the skins surface is called the
Hair stem or shaft
Name the club-shaped structure that forms the lower part of the hair root
Hair bulb
What layer of the hair contains no melanin
Cuticle
What are the building block of all proteins
Amino acids
What is the chemical cross bond found in the hair
Di-sulfide
Name the area of special reproducing cells, on the outer portion of the hair papilla
Germinal matrix
The average growth cycle of hair usually last
4-7years
Name the short very fine hair found on the body
Secondary
Shaving will cause hair to grow at a faster rate
False
Which type of pigment produces red to yellow melanin
Oxymelanin
Chemical cross bonds are formed by a unique amino acid called
Cystine
Name a tube like depression or pocket in the skin that encases the hair root
Hair follicle
Name the long soft hair found on the scalp
Tertiary
Which shade of hair has about 140,000 hairs on the scalp
Blonde
Hair is made of
Hard keratin
The special cells responsible for the production of melanin are called
Melanocytes
What is the average percent of sulphur found in the hair
9 to 12
Oxygen, amino acids and nutrients needed for the production of hair reach the germinal matrix through the what
Papillary capillaries
The degree of courseness is called
Texture
Is hair a living cell after the hair shaft pushes above the skins surface
No
Short coarse, bristly hairs found on the body are known as
Terminal hair
Hair gets its shape size and direction from the
Hair follicle
The ability of the hair to absorb moisture is know as
Porosity
An important function of the hair cuticle is to
Protect the cortex
