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The study of hair
Trichology
One way to help cultviate a healthy scalp is by utilizing:
A balanced diet
Full-grown human hair is divided into two principal parts known as:
Hair root and hair shaft
A tube like depression, or pocket in the skin or scalp that encases the hair root is called:
Follicle
A thicked, club- shaped structure that forms the lower part of the hair root; Lowest part of a hair strand.
Hair Bulb
A small involuntary muscle attached to the underside of a hair follicle
Dermal Papilla
Boil; Acute localized bacterical infection on the hair follicle.
Furucle
Small, cone-shaped elevation located at the base of the hair follicle that fit into the hair bulb
Dermal Papilla
A small minute involuntary muscle in the base of the hair follicle that causes goose bumps
Arrector Pili
Abnormal Hair
Alopecia
Sudden falling out of hair in patches or baldness in spots without inflammation; may occur on scalp and elsewhere on the body
Alopecia Areata
Units that are joined together end to end by peptide bonds to form the polypeptide chains that comprise porteins
Amino Acids
Growth phase in the hair cycle in which a new hair shft is created
Anagen
Hair lost characterized by miniaturization of terminal hair which is converted to vellus hair; In men, it is known as male patten baldness
Androgenic Alopecia
Technucal term for gray hair; results from the loss of the hairs natural melanin pigment
Canities
Inflammation of the subcutaneous tissue caused by staphylococci; Similar to a furuncle but larger
Carbuncle
The brief transition period between the growth and resting phases of a hair follicle
Catagen
The five elements that make up human hair, skin, tissue and skin (carbon, oxygen, hydrogen, nitrogen, and sulfer.)
COHNS Elements
Middle layer of the hair; a fibrous protien core formed by elongated cells containing melanin pigment.
Cortex
The Portion of the hair that projects beyond the skin
Hair Shaft
Tuft of hair that stands straight up
Cowlick
Outermost layer of hair,consisting of a single overlapping layer of transparent, scale-like cells
Cuticle
Small, cone shaped elevation located at the base of the hair follicle that fits into the hair bulb
Dermal Papilla
Strong chemical side bonds that join the sulfur atoms of two neighboring cystenie amino acids to create cystine, which joins together two polypepride strands like rungs on a ladder
Disulfide Bond
Melanin that gives brown and black color to hair.
Eumelanin
Techical term for brittle hair
Fragilitas Crinium
Hair textue refers to the degree of ____ __ ____ of the Hair
Coarseness or Fineness
Hair that forms a circular pattern is:
Whorl
______ is the tiny grains of pigment in the cortex that give natural color to the hair.
Melanin
The technical term for hair that is in a dry, brittle, condition including formation of nodular swellings along the hair shaft is:
Trichorrhexis Nodosa
The ability of the hair to stretch and return to its original form without breaking is called:
Hair Elasticity
The ability of the hair to absorb mositure is called:
Hair Porosity
A side bond that is easily broken by a strong alkalinr or acidic solutions is called a _____ bond.
Salt Bond
All hair follicles have the same structure and cycle through the same three phases which are:
Anagen (growing) Catagen( tranitional) Telogen (Resting)
As newly formed cells mature, they fill up with a fibrus _____ then more upward, lose their nucleus, and die. This process is called Keratinization.
Protein
Normal hair contains ____ of nitrogen.
17%
Normal hair contain ___ of Carbon.
51%
Normal hair contains ___ of oxygen.
21%
Normal hair contains ___ of Hydrogen.
6%
The number if individual hair strand in 1 sq. in. if the scalp indicates ______.
Hair Density
The shape of the hair strand described as straight, wavy, curly, or extremely curly is known as _____.
Wave Pattern.
Hair is composed if cells arranged in three layers which are:
Cuticle, cortex, medulla
Pheomelanin provides natural hair color for ______ tones.
Red
The chemical bond that joins amino acids to each other is called a ____.
Peptide Bond
Hair flowing in the same direction, resulting from follicles sloping in the same direction.
Hair Stream
Thickness or diamter of he individual hair strands.
Hair Texture
Spiral shape created by polypeptide chains that intertwine around each other
Helix
Weak physical side bond that is easily broken by ater or heat
Hydrogen bond
Condition of abnormal growth of hair, characterized by the growth of terminal hair in areas of the body that normally grow only vellus hair
Hypertrichosis (Hirsuties)
Largest and fastest growing organ of the body; composed of the hair, skin and nails.
Integument
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