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Skin and Hair

Last Updated on Nov 27, 2023
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Human Skin

  • The skin is the largest organ in our body (1 Trusted Source
    Skin explained

    Go to source
    ).
  •  The human skin contains 45 miles of nerves.
  • There are 3 million cells in one square inch of skin.

Weight of the Skin

  • Our skin weighs around one-seventh of our total weight and is the largest and heaviest organ in our body (2 Trusted Source
    How does skin work?

    Go to source
    ).
  • The total weight of skin in an average human adult is 61 pounds.
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Nail Growth

  • Fingernails grow faster than toenails (3 Trusted Source
    Clinical Methods: The History, Physical, and Laboratory Examinations

    Go to source
    ). The nails of the toes and fingers take about 6 months to grow from base to tip (4 Trusted Source
    Understanding the Formidable Nail Barrier: A Review of the Nail Microstructure, Composition and Diseases

    Go to source
    ).

Receptors

  • There are 100 receptors at each of our fingertips.
  • The human skin contains 280,000 heat receptors.

Fastest Growing Tissue

  • Next to the bone marrow, hair is the fastest-growing tissue in the body (5 Trusted Source
    Low-Level Laser (Light) Therapy (LLLT) for Treatment of Hair Loss

    Go to source
    ).

Thick Skin Vs Thin Skin

  • The thickest skin is found on your feet, whereas the thinnest areas of skin are your eyelids (6 Trusted Source
    Anatomy, Skin (Integument)

    Go to source
    ).

Sweat Glands

  • Our feet contain about 250,000 sweat glands.
  • The palms of the hands and soles of the feet contain more sweat glands than other parts of the body (7 Trusted Source
    Physiology of sweat gland function: The roles of sweating and sweat composition in human health

    Go to source
    ).
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UV Radiation and Sun Exposure

  • About 80% of the ultra-violet rays from the sun can get through the cloud and can cause sunburn or tan even on a cloudy day (8 Trusted Source
    Comprehensive review of ultraviolet radiation and the current status on sunscreens

    Go to source
    ).

Color of the Skin

  • Melanin, a pigment present in the skin is responsible for the color of the skin of a person (9 Trusted Source
    The structure of people's hair

    Go to source
    ).

Outermost Layer of the Skin

  • The epidermis, the outermost layer of the skin, renews itself constantly on its own (2 Trusted Source
    How does skin work?

    Go to source
    ).

Dead Skin Cells

  • Every minute, 30,000 to 40, 000 dead skin cells fall from our body.

Human Hair

  • Adult human hair can grow up to a length of approximately 90cm (9 Trusted Source
    The structure of people's hair

    Go to source
    ).
  • The life span of hair is two to seven years (10 Trusted Source
    Aging changes in hair and nails

    Go to source
    ).
  • On average, the human scalp has 100,000 hairs (11 Trusted Source
    Advances in hair growth

    Go to source
    ). 
  • A hair grows by 0.35 mm per day, 0.5 inches per month and 6 inches per year (12 Trusted Source
    Anatomy, Hair

    Go to source
    ).
  • 100 hairs are likely to fall every day (13 Trusted Source
    The Diagnosis and Treatment of Hair and Scalp Diseases

    Go to source
    ).

Hair Follicles

  • Circular hair follicles produce straight hair, whereas oval follicles make curlier hair (14 Trusted Source
    Trichonodosis

    Go to source
    ).
  • Goosebumps arise when tiny muscles called arrector pili muscles in our skin's hair follicles pull hair upright (15 Trusted Source
    What goosebumps are for

    Go to source
    ).

Color of the Hair

  • The color of our hair is determined by melanin, a pigment present in the human body (16 Trusted Source
    Is hair color determined by genetics?

    Go to source
    ).

Ability of Hair

  • A single strand of hair has the ability to support up to 100 grams of weight, and all the hair has the ability to support up to 12 tones of weight.

References:

  1. Skin explained - (https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/skin )
  2. How does skin work? - (https://www.ncbi.nlm.nih.gov/books/NBK279255/)
  3. Clinical Methods: The History, Physical, and Laboratory Examinations - (https://www.ncbi.nlm.nih.gov/books/NBK211/)
  4. Understanding the Formidable Nail Barrier: A Review of the Nail Microstructure, Composition and Diseases - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383514/)
  5. Low-Level Laser (Light) Therapy (LLLT) for Treatment of Hair Loss - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3944668/)
  6. Anatomy, Skin (Integument) - (https://www.ncbi.nlm.nih.gov/books/NBK441980/)
  7. Physiology of sweat gland function: The roles of sweating and sweat composition in human health - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773238/ )
  8. Comprehensive review of ultraviolet radiation and the current status on sunscreens - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3460660/)
  9. The structure of people's hair - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4201279/)
  10. Aging changes in hair and nails - (https://medlineplus.gov/ency/article/004005.htm)
  11. Advances in hair growth - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8808739/)
  12. Anatomy, Hair - (https://www.ncbi.nlm.nih.gov/books/NBK513312/)
  13. The Diagnosis and Treatment of Hair and Scalp Diseases - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4908932/)
  14. Trichonodosis - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4124693/)
  15. What goosebumps are for - (https://www.nih.gov/news-events/nih-research-matters/what-goosebumps-are)
  16. Is hair color determined by genetics? - (https://medlineplus.gov/genetics/understanding/traits/haircolor/)
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