HISTOLOGY
INTEGUMENTARY SYSTEM SKIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Body hair and nails are both made of what?
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Keratin
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Epidermal cells
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Melanin
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Stem cells
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Explanation:
Detailed explanation-1: -Alpha-keratin : Alpha-keratin is in the hair, epidermis, horns and nails of mammals.
Detailed explanation-2: -There are two types of keratin fibres that exist in hair: type I with acidic amino acid residues and type II with basic amino residues. One strand of type I fibre and one strand of type II fibre spiral together to form coiled-coil dimers.
Detailed explanation-3: -Historically, the term ‘keratin’ stood for all of the proteins extracted from skin modifications, such as horns, claws and hooves. Subsequently, it was realized that this keratin is actually a mixture of keratins, keratin filament-associated proteins and other proteins, such as enzymes.
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