Questions and Answers
The scientific study of hair, its diseases, and care is called:
What are the two parts of a mature strand of human hair?
Hair shaft and hair root
What is the tube-like depression or pocket in the skin or scalp that contains the hair root?
Follicle
Hair follicles are not found on the:
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What is the tiny, involuntary muscle in the base of the hair follicle called?
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What is the oily substance secreted from sebaceous glands?
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For chemicals to penetrate a healthy cuticle hair layer, they must have what?
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The medulla is composed of what type of cells?
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What is the process whereby living cells mature and begin their journey up the hair shaft?
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What are the five main elements that make up the chemical composition of human hair?
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What are the chemical bonds that hold together the amino acid molecules called?
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Which type of melanin provides natural colors ranging from red and ginger to yellow and blond tones?
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Asians tend to have what type of hair?
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To help minimize tangles in extremely curly hair when washing, you should use what?
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How is hair texture classified?
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What is the measurement of individual hair strands on 1 square inch (2.5 square centimeters) of the scalp called?
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Compared to hair with high porosity, chemical services performed on hair with low porosity require what?
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Wet hair with normal elasticity can stretch up to what percentage of its original length?
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How can oily scalp and hair be treated?
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Which type of hair almost never has a medulla?
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What is the growth phase during which new hair is produced?
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What is the average growth of healthy scalp hair?
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What is the technical term used to describe gray hair?
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What is a condition of abnormal hair growth on areas of the body?
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What is the medical term for dandruff?
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How many amino acids that make up hair can the body produce?
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Salt bonds account for about what fraction of the hair's overall strength?
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The anagen phase generally lasts from three to how many years?
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Is scalp hair growth faster on women than on men?
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What phase signals the end of hair growth?
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Does scalp massage affect hair growth?
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Compared to pigmented hair, is gray hair coarser or more resistant?
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Could cross-sections of hair be almost any shape?
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How are bald men commonly perceived?
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By age 35, almost what percentage of both men and women show some degree of hair loss?
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What is finasteride intended for?
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When do congenital canities manifest?
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Dandruff can easily be mistaken for what?
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What is believed to cause dandruff?
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What is the most frequently encountered fungus infection resulting from hair services?
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What characterizes tinea?
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What is the infestation of the hair and scalp with head lice called?
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Study Notes
Trichology and Hair Structure
- Trichology is the scientific study concerning hair, its diseases, and care.
- A mature human hair strand consists of two parts: the hair shaft and the hair root.
- Hair follicles are tube-like structures in the skin that house the hair root; absent on the soles of the feet and palms.
- The arrector pili is a small muscle at the base of each hair follicle, contributing to goosebumps.
Hair Composition and Growth
- Sebum, produced by sebaceous glands, is an oily substance that lubricates hair.
- Healthy hair cuticles allow chemical penetration when exposed to alkaline pH levels.
- The medulla, the innermost layer of hair, is made up of round cells.
- Keratinization is the process where living cells mature and ascend in the hair shaft.
- Human hair primarily consists of carbon, oxygen, hydrogen, nitrogen, and sulfur.
Hair Properties and Characteristics
- Peptide bonds link amino acids forming the proteins in hair.
- Pheomelanin is the type of melanin responsible for red, ginger, yellow, and blond hair tones.
- Asian hair tends to be extremely straight, influencing styling approaches.
- Hair texture is classified into coarse, medium, or fine categories.
Density, Porosity, and Elasticity
- Hair density measures the number of hair strands in one square inch of the scalp.
- Chemically treated hair with low porosity requires stronger alkaline solutions compared to high porosity hair.
- Wet hair with normal elasticity can stretch up to 50% of its original length.
Hair Care and Scalp Conditions
- An oily scalp is best treated with normalizing shampoo.
- Vellus hair is a type that almost never contains medulla.
- The anagen phase is when new hair growth occurs, lasting typically three to five years.
- The average rate of healthy scalp hair growth is approximately 1/2 inch (1.25 cm) per month.
Hair Loss and Conditions
- "Canities" refers to graying hair, while "Hypertrichosis" is abnormal hair growth in unexpected areas.
- Pityriasis is the medical term for dandruff, often caused by a fungus.
- Dandruff may be confused with dry scalp conditions.
- Tinea barbae is the most common fungal infection related to hair services, characterized by itching.
- Pediculosis Capitis is the infestation of the scalp with head lice.
Sociocultural Perceptions
- Baldness is often negatively perceived, associating bald men with decreased success.
- By the age of 35, approximately 40% of both men and women experience some hair loss.
- Finasteride, an oral medication for hair loss, is specifically prescribed for men.
Additional Insights
- Scalp massage does not significantly influence hair growth rates.
- Gray hair is not inherently coarser or more resistant than pigmented hair.
- Hair cross-sections can take on various shapes, indicating diverse hair types.
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Description
Test your knowledge on the properties of hair and scalp with this practice quiz based on Milady's Chapter 11. Explore essential terms like trichology, hair structure, and the function of hair follicles. Perfect for those studying cosmetology or hair care.