Chapter 11 Flashcards
Properties of the hair and scalp (68 cards)
Alopecia
Abnormal hair loss.
Alopecia areata
Autoimmune disorder that causes the effected hair follicles to be mistakenly attacked by a person’s own immune system;usually begins with one or more small, round,smooth bald patches on the scalp.
Alopecia totalis
al-oh-PEE-shah toh-TAHL-us
Total loss scalp hair.
Alopecia universalis
Complete loss of body hair .
Amino acids
Units that are joined together end-to- end like pop beads by strong, chemical peptides bonds (end bonds) to form the polypeptide chains that comprise proteins.
Anagen phase
Also known as the growth phase; phase during which new hair is produced.
Androgenic alopecia
an-druh-JEN-ik al-oh- PEE-shah
Also known as androgenetic alopecia hair loss characterized by miniaturization of terminal hair that is converted to vellus hair; in men, it is known as, as Male pattern baldness.
Arrector pili muscle
The smallest, involuntary muscle in the base of the hair follicle.
Canities
Technical term gray hair; results from the loss of the hair’s natural melanin pigment.
Carbuncle
Inflammation of the subcutaneous tissue caused by staphylococci ; similar to a fur uncle but larger.
Catagen phase
The brief transition period between the growth and resting phase of a hair follicle. It signals the end of the growth phase.
COHNS elements
The five elements - carbon, oxygen, hydrogen, nitrogen, and sulfur - that make up human hair, skin, tissue, and nails.
Cortex
Middle layer of the hair; a fibrous protein core formed by elongated cells containing melanin pigment.
Cowlick
Tuft of hair stands straight up.
Cysteine
An amino acid with a sulfur atom (s)that joins together two peptide strands.
Cysteine
SIS-teen
An amino acid formed when 2 cysteine amino acids ( with single sulfur) are joined by their sulfur groups or sulfide bond.
Dermal papilla
Plural: dermal papillae.a small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb.
Disulfide bond
Strong chemical side bond that joins the sulfur atoms of two neighboring cysteine amino acids to create one cysteine, which joins together two polypeptide strands like rings on a ladder.
Eumelanin
Provides natural dark drown to black color to the hair and is the dark pigment predominant in black and brunette hair
Fragilitas crinium
Technical term for brittle hair
Furuncle
Boil; acute, localized bacterial infection of the hair follicle that produces constant pain
Hair bulb
Lowest part of hair strand; the thickened , cone-shaped structure that forms the lower part of the hair root.
Hair cuticle
Outermost layer of the hair; consisting of a single, overlapping layer of transparent, scale-like cells that look like shingles on a roof.
Hair density
The number of individual hair strands on 1 square inch of scalp.