Chapter 11
Spiral-shaped
A helix is:
Ringed hair
Alternating bands of gray and pigmented hair throughout the length of the hair strand is called :
Peptide
Amino acids are joined by ___ bonds.
Furuncle
An acute , localized bacterial infection of a hair follicle that produces constant pain, is called a boil or a :
One-third
Disulfide bonds account for about ___ of the hairs overall strength
Have a fairly regular and uniform diameter along a single strand
Extremely curly hair does NOT typically :
Thick, coarse hair
Generally , only which. Type of hair contains a medulla?
Texture
Hair ___ is the thickness or diameter of the individual hair strand.
Palms of hands and soles of feet
Hair follicles are distributed all over the body, with the exception of the:
Protein
Hair is approximately 90%:
Coarse
Hair that has the largest diameter and usually requires more processing time is:
Two
How many hair growth treatments have been approved by the FDA for sale in the U.S.?
Lanthionine bonds
Hydroxide chemical hair relaxers break disulfide bonds and convert them to:
Cortex
Most of the total weight of hair comes from which layer of the hair?
Anagen
New hair is produced during the ___ phase, or growth phase, of hair growth.
End bonds
Peptide bonds are also known as:
Red to blond
Pheomelanin provides hair colors ranging from:
Three
Polypeptide chains are cross-linked like the rungs on a ladder by ___ different types of side bonds.
Amino acids
Proteins are made of long chains of:
Malassezia
Research has determined that dandruff is the result of a fungus called:
Both strong alkaline and strong acidic
Salt bonds can be broken by ___solutions
Sebaceous
The ___ glands secrete sebum.
Hair follicle
The ___ is the tube-like depression in the skin or scalp that contains the hair root.
2,200
The average hair density is about how many hairs per square inch?
Pityriasis
The condition characterized by the excessive production and accumulation of skin cells is:
Hypertrichosis
The condition that describes abnormal growth of hair is:
Elongated
The cortex of the hair has a fibrous protein core formed by ___ cells.
Telogen
The final phase in the hair cycle , lasting until the fully grown hair is shed, is the ___ phase.
COHNS
The five major elements in skin and hair are referred to as the ___ elements.
Keratinization
The maturing process of hair is:
Round
The medulla is composed of ___ cells.
Hair shaft
The portion of the hair that projects above the skin is the:
Trichology
The scientific study of hair and its diseases and care is called:
Dermal papilla
The small, cone-shaped area at the base of the hair follicle that fits into the hair bulb is the:
Fragilitas crinium
The technical term for brittle hair is:
Canities
The technical term used to describe gray hair is:
Alopecia
The term used to describe abnormal hair loss is:
Hair bulb
The thickend, club-shared structure that forms the lower part of the hair root is the:
Hair root and hair shaft
The two parts of a mature strand of human hair are:
Shape
The wave pattern of the hair refers to the ___ of the hair strand
Disulfide
Thio neutralizes are used to reform ___ bonds.
Knotted hair
Trichorrhexis nodosa is the technical term for:
Elasticity
Unique protein structures within the cortex are responsible for the color and ___ of hair.
Scabies
When a parasite called a mite burrows under the skin, the result is:
Hair cuticle
Which layer of hair consists of transparent, scale-like cells?
Hair cuticle
Which layer of hair provides a barrier that protects the inner structure hair?
Alopecia areata
Which of the following conditions is an autoimmune disorder?
Cortex bonds
Which of the following is NOT one of the three types of side bonds of the cortex?
Postpartum alopecia
Which type of alopecia describes temporary hair loss at the end of a pregnancy?
Hydrogen bond
Which type of the side bond can be broken by water or heat?