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CH. 11

Properties Of The Hair & Scalp CH. 11

Term
The scientific study of the hair, its diseases, and care is called trichology.
The two parts of a mature strand of human hair are the hair root and hair shaft.
The tube-like depression or a pocket in the skin or scalp that contains the hair root is the hair follicle.
Hair follicles are not found on the soles of the feet.
The arrector pili muscle is the small, involuntary muscle in the base of the hair follicle.
The fatty or oily substance secreted by the sebaceous glands is sebum.
For chemicals to penetrate a healthy cuticle hair layer, they must have an alkaline pH.
The medulla is composed of round cells.
During the anagen phase, new hair is produced because new cells are actively manufactured in the hair follicle.
The major elements that make up human hair are carbon. oxygen, hydrogen, nitrogen, and sulfur.
The strong, chemical bonds that join amino acids are called peptide bonds.
Pheomelanin provides natural colors ranging from red and ginger to yellow and blond tones.
Asians tend to have extremely straight hair.
To help minimize tangles in extremely curly hair when shampooing, you should use a detangling rinse.
Hair texture is classified as coarse, medium, or fine.
The measurement of the number of individual hair strands on one square inch (2.5 square centimeters) of the scalp is hair density.
Compared to hair with high porosity, chemical services performed on hair with low porosity require more alkaline solutions.
Wet hair with normal elasticity will stretch up to 50 percent of its original length and return to that length without breaking.
Oily hair and scalp can be treated by properly washing with a normalizing shampoo.
Vellus hair almost never has a medulla.
During the catagen phase, the follicle canal shrink and detach from the dermal papilla.
The average growth of healthy scalp hair is 1/2 inch (1.25 centimeters) per month.
The technical term used to describe gray hair is canities.
A condition of abnormal growth of terminal hair in areas of the body that normally grow only vellus hair is hypertrichosis.
The technical term for dandruff is pityriasis.
Dermal papilla is one of the 5 main structures of the hair root that contains the blood and nerve supply that provides the nutrients needed for hair growth.
Because there are so many of them, salt bonds account for about one third of the hair's overall strength.
The anagen phase generally lasts from three to five years.
Scalp hair grows faster on women than on men.
The catagen phase signals the end of the growth phase.
Scalp massage does not increase hair growth.
Compared to pigmented hair, gray hair is exactly the same.
Cross-sections of hair can be almost any shape.
Bald men are commonly received as less successful.
By age 35, almost 40 percent of both men and women show some degree of hair loss.
Finasteride is an oral prescription medication for hair loss that is meant for men only.
Congenital canities exists at or before birth.
Dandruff can easily be mistaken for dry scalp.
Current research confirms that dandruff is the result of a fungus.
When the living cells of hair form and begin their journey upward through the hair follicle, they mature in a process called keratinization.
Tinea is characterized by itching, scales, and sometimes, painful circular lesions.
The infestation of the hair and scalp with head lice is called pediculosis capitis.
A carbuncle is similar to a furuncle but is larger.
Fine hair is more fragile than coarse or medium hair.
Coarse hair is stronger than fine hair.
The hair cuticle is the outermost layer of the hair.
The oil glands in the skin that are connected to the hair follicles are the sebaceous glands.
A hydrogen bond is a weak, physical, cross-link side bond easily broken by water or heat.
Hair is approximately 90 percent protein.
Total scalp hair loss is known as alopecia totalis.
Hypertrichosis is also known as hirsuties.
The naturally occurring fungus that causes the symptoms of dandruff when it grows out of control is malassezia.
The hair bulb is the lowest part of a hair strand.
The technical term for beaded hair is monilethrix.
A highly contagious skin disease cause by a parasite called a mite that burrows under the skin is scabies.
The term for the spiral shape of a coiled protein is helix.
Shaving, clipping, and cutting the hair on the head has no effect on hair growth.
Dry, sulfur-yellow, cuplike crusts on the scalp are called scutula.
The hair, skin, nail, and glands are part of the integumentary system.
The long, coarse, pigmented hair found on the scalp, legs, arms, and bodies of males and females is called terminal hair.
The technical term for knotted hair is trichorrhexis nodosa.
The medulla is the innermost layer of the hair and is composed of round cells.
When hair leaves the follicle at an angle and forms patterns or streams on the head, it is called a whorl.
The part of the hair located below the surface of the epidermis is the hair root.
A particular pattern of hair stream that is usually more noticeable on the front hairline in people with short, thick hair is a cowlick.
The ability of the hair to absorb moisture is called hair porosity.
The middle layer of the hair is the cortex.
An autoimmune disorder that causes the affected hair follicles to be mistakenly attacked by a person's own immune system is alopecia areata.
Vellus hair is also known as lanugo hair.
The technical term for ringworm is tinea.
Created by: Kiwis
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