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30 Cards in this Set
- Front
- Back
The scientific study of hair, its disorders, & care is called:
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Trichology
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The hair is a threadlike outgrowth of the skin present on the:
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Scalp
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The chief purpose of hair is to:
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Protect & Adorn
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Hair is chiefly composed of a horny substance called:
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Keratin
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Hard keratin is a substance composed of:
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Protein
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That portion of the hair found beneath the skin surface is called the:
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Hair Root
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The portion of the hair that extends beyond the skin surface is known as the:
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Hair Shaft
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The portion of the hair that is not enclosed within the follicle is the:
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Hair Shaft
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The main structures of the hair root are the:
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Follicle, The Bulb, Dermal Papilla, Sebaceous Glands, & Arrector Pili Muscle
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A tub like depression in the skin or scalp that encases the hair root is the:
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Hair Follicle
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The natural flow of the hair as it emerges from the scalp & slants in a particular direction is known as the:
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Hair Stream
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A club-shaped structure that forms the lower part of the hair root is the:
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Hair Bulb |
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A small, cone-shaped elevation at the base of the hair follicle is called the |
Dermal Papilla |
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Nourishment reaches the hair bulb through the:
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Dermal Papilla
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Saclike structures with ducts that are attached to each hair follicle are called:
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Sebaceous Glands
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Glands that secrete sebum to the hair & scalp are called:
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Sebaceous Glands |
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Some factors that influence sebum production are:
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Diet & Blood Circulation, Stimulated Endocrine Glands, & Emotional Disturbances & Drugs
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An involuntary muscle fiber attached to the underside & base of the hair follicle is the:
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Arrector Pili Muscle
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The three main layers of the hair shaft are the:
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Cuticle, Cortex, & Medulla
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The outermost layer of the hair shaft is the:
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Cuticle
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To penetrate the cuticle layer in order to reach the cortex, a solution must be:
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More Alkaline Than The Hair
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Changes that take place in the hair during chemical services occur within the:
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Cortex
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About 90 percent of the total weight of the hair can be traced to the:
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Cortex
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That portion of the hair that provides strength, elasticity, & natural color is the:
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Cortex
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The innermost layer of the hair shaft is the:
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Medulla
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Hair cells mature in the follicle through a process known as:
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Keratinization |
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Hair is made of approximately
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91% Protein |
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The elements found in human hair are:
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Carbon, Oxygen, Hydrogen, Nitrogen, & Sulfur (COHNS Elements)
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Proteins are made of long chains of chemical units known as:
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Amino Acids
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Peptide bonds join amino acids:
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End to End |