Hair
What is the part of the hair located beneath the skin’s surface
Hair Root
What structure forms the base of the hair follicle and provides nourishment
Dermal Papilla
What is the outermost layer of the hair shaft
Cuticle
Which layer describes the medulla in the hair shaft
The innermost layer, often absent in fine hair
What layer of hair is affected during chemical treatments like coloring?
Cortex
What is the growth phase of the hair cycle called?
Anagen
What determines the natural color of hair?
Melanin production
What is the term for hair loss due to natural shedding
Normal shedding
What type of hair is typically found on the scalp and eyebrows?
Terminal Hair
What is the average rate of hair growth on the scalp per month?
1/2 inch
Doing which phase does the hair follicle rest?
Telogen
What percentage of scalp hair is typically in the antigen phase?
90%
What term describes excessive hair growth in unusual areas
Hypertrichosis
What type of hair is soft, fine, and unpigmented
Velllus Hair
Which of the following factors affect the hair growth cycle?
Nutrition and hormones
What happens during the catagen phase?
The follicle shins to shrink and detach
Eumelanin is responsible for which hair color
Brown & Black
What role do sebaceous glands play in hair health?
Lubricate the hair with sebum
What external factor most commonly damages, the hair follicle
Overuse of heat styling tools
What are the nutrients that support healthy hair growth
Vitamin C & B complex
Zinc
How long does the anagen phase typically last?
3 - 7 yrs
What type of melanin produces red and blonde pigments?
Pheomelanin
What is the function of the arrector pilli muscle?
Cause hair to stand up in response to cold or fear
What hair condition is characterized by brittle hair and split ends?
Trichoptilosis
What is Trichology
The study od hair and scalp disorders