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2. Hair follicle - Wikipedia

   en.wikipedia.org/wiki/Hair_follicle

   There are many structures that make up the hair follicle. Anatomically, the triad of hair follicle, sebaceous gland and arrector pili muscle make up the pilosebaceous unit. [1] A hair follicle consists of : The papilla is a large structure at the base of the hair follicle. [4] The papilla is made up mainly of connective tissue and a capillary ...

3. Hair analysis - Wikipedia

   en.wikipedia.org/wiki/Hair_analysis

   It is also used by employers, who test their employees. [6] Hair analysis has the virtue of showing a 'history' of drug use due to hair's slow growth. Urine analysis might detect drugs taken in the past 2–3 days; hair analysis can sometimes detect use as far as 90 days, although certain cosmetic treatments (e.g. dyeing hair) can interfere ...

4. Hair loss - Wikipedia

   en.wikipedia.org/wiki/Hair_loss

   A key aspect of hair loss with age is the aging of the hair follicle. [59] Ordinarily, hair follicle renewal is maintained by the stem cells associated with each follicle. Aging of the hair follicle appears to be primed by a sustained cellular response to the DNA damage that accumulates in renewing stem cells during aging. [60]

5. How Common Is Teenage Hair Loss? - AOL

   www.aol.com/common-teenage-hair-loss-125700178.html

   Growing hair is like a workout for your scalp — hair follicle cells are the most rapidly dividing cells in the body, so it takes lots of energy to produce new hair. ... They can do a blood test ...

6. Management of hair loss - Wikipedia

   en.wikipedia.org/wiki/Management_of_hair_loss

   Hair follicle with mesenchymal dermal papilla, labelled at top, location of hair follicle stem cells and thought to be site of action of DHT. Type 1 and 2 5α reductase enzymes are present at pilosebaceous units in papillae of individual hair follicles. They catalyse formation of the androgens testosterone and DHT, which in turn regulate hair ...

7. Non scarring hair loss - Wikipedia

   en.wikipedia.org/wiki/Non_scarring_hair_loss

   A clinician grabs sections of hair and observes for active hair loss. A positive pull test is usually caused by telogen effluvium, androgenetic alopecia, and alopecia areata. [10] Tug Test. A doctor holds the top and bottom of a strand of hair and observes for a break in the middle which may be caused by a hair shaft abnormality. [10] Card Test