Hair & Nails

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Last updated 3:33 PM on 9/28/23
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14 Terms

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Keratin
A hard protein that makes up the structure of hair and nails.
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Hair follicle
The root of the hair located within the dermis, where hair cells divide and new cells are formed.
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Cuticle
The outermost layer that protects the shaft of the hair.
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Arrector pili muscles
Tiny muscles that attach to the hair shaft, causing the hair to stand on end.
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Nails
Protective structures made of keratin that serve as tools.
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Nail matrix
The area where heavily keratinized cells are produced, forming the nail body.
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Lunula
The whitish, crescent-shaped area at the base of the nail, visible due to the thickness of the nail.
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Hair bulb
The region within the hair follicle where hair cells divide and new cells are formed.
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Nail folds
The surrounding skin that protects the nail on three sides.
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Free edge
The visible part of the nail that extends beyond the finger or toe.
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Body
The visible part of the nail that lies on top of the nail bed.
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Root
The part of the nail that is not visible and is embedded in the skin.
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Nail bed
The area beneath the nail where the nail body rests.
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Hair functions
The various roles of hair, such as heat insulation, sun protection, insect alert, and eye/nose protection.