Chpt 8 Hair N Scalp

An exam review for cosmetology college class. Info taken from http://glowstick.us and made into a flash card. 

90 cards   |   Total Attempts: 188
  

Cards In This Set

Front Back
The branch of science that focuses on the hair, its diseases, and its care is called:
trichology

The term "trichology" is derived from the Greek words trichos (hair) and ology (the study of).
The hair is divided into two parts, the hair root and the:
hair shaft

The hair shaft is the portion of the hair that projects beyond the skin.
The hair root is made up of three main structures, the follicle, bulb, and:
dermal papilla

The papilla is a small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb.
The tube-like depression in the skin that contains the hair root is the:
follicle

The follicle grows downward from the epidermis into the dermis, where it surrounds the dermal papilla.
The lower part of the hair root is the club-shaped:
hair bulb

The lower part of the bulb fits over and covers the dermal papilla.
The nutrients the hair needs for growth are supplied by the blood and nerve supply that are contained in the:
dermal papilla

The dermal papilla is a small, cone-shaped elevation located at the bottom of the hair follicle that fits into the hair bulb.
At the base of the follicle is a tiny involuntary muscle called the:
arrector pili

Fear or cold cause this muscle to contract, making the hair stand up straight and resulting in "goose bumps."
Sebum, the oily substance that lubricates the hair and skin, is secreted by the:
sebaceous glands

The sebaceous glands are the oil glands of the skin, connected to the hair follicles.
The hair shaft is made up of three layers; the cuticle, cortex, and:
medulla

The medulla is the innermost layer, referred to as the pith or marrow of the hair shaft.
The hair shaft is protected from penetration and damage by the:
cuticle

The cuticle is the outermost layer of hair and consists of transparent, scale-like cells that overlap like shingles on a roof.
The layer of hair that is generally only present in thick, coarse hair is the:
medulla

It is quite common for the medulla to be lacking in other kinds of hair.
Most of the total weight of the hair--about 90%--comes from the:
cortex

The cortex is the middle layer of the hair and accounts for about 90% of its total weight.
Swelling the hair raises the ________ and allows liquids to penetrate.
cuticle

Swelling the hair raises the cuticle layer and opens the space between the scales, which allows liquids to penetrate.
Oxidation haircolors, perm solutions, and chemical relaxers, in order to penetrate the cuticle, must have:
an alkaline pH

These products all have a pH above 7.0, which raises the cuticle and allows penetration into the cortex.
Permanent waving, chemical relaxing, and oxidation haircoloring cause changes that occur in the:
cortex

The cortex is the middle layer of the hair and contains the structures affected by these procedures.