The portion of the hair that projects above the skin
What is Hair Shaft
100
The lowest area or part of a hair strand. It is the thickened club-shaped structure that forms the lower part of the hair root.
What is hair bulb?
100
The middle layer of hair; a fibrous protein core formed by elongated cells containing melanin pigment.
What is the cortex?
100
Name the three side bonds.
What are hydrogen bonds, salt bonds, and disulfide bonds?
100
As we age elastin fibers naturally weaken, causing a loss of...
What is elasticity?
200
The part of the hair located below the surface of the scalp
What is Hair Root
200
A minute, involuntary mucle in the skin inserted in the base of the hair follicle. Fear or cold causes it to contract, which makes the hair stand up straight.
What is the arrector pili?
200
The innermost layer; also referred to as the pith of the hair.
What is the medulla?
200
The middle layer of hair is made up of millions of these.
What are polypeptide chans?
200
A solution with a pH value of 7 indicates a...
What is a neutral solution?
300
How many amino acids make up hair?
What is 20?
300
Oil glands of the skin, connected to the hair follicles.
What are sebaceous glands?
300
The outermost layer of the hair. It consists of a single, overlapping layer of transparent, scalelike cells that overlap like shingles on a roof.
What is the cuticle?
300
This side bond is easily broken by water or heat.
What is a hydrogen bond?
300
What are the two types of bacteria?
What are pathogenic and nonpathogenic?
400
How many amino acids does the body produce naturally?
What is 11?
400
The tubelike depression, or pocket, in the skin or scalp that contains the hair root.
What is the follicle?
400
This type of hair is least likely to have a medulla.
What is very fine and naturally blonde hair?
400
This chemical bond joins the sulfur atoms of two neighboring cysteine amino acids to create cystine.
What is a disulfide bond?
400
What is the technical term for head lice?
What is pediculosis capitis?
500
A slender, threadlike filament of protein keratin which is an appendage or outgrowth of the scalp and body.
What is hair?
500
A small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb. It contains the blood and nerve supply that provides the nutrients needed for growth.
What is the dermal papilla?
500
Changes resulting from chemical services occur in this part of the hair.
What is the cortex?
500
This bond is easily broken by strong alkaline or acidic solutions.