Chapter 1
The skin as a living shield
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Chapter 2
The science of hair and nails
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Chapter 3
The skin as a living ecosystem
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YOUR GOAL
Master of The human integumentary system
Ch 2 · The science of hair and nails
artiteacher Hair and Nails
Hair on your head, nails on your hands, keratin's running the show!
Fun Fact
Nail growth: Fingernails grow faster on your dominant hand because increased usage boosts blood circulation to the fingertips.
Glossary
keratin (noun)
A tough, fibrous protein that forms the main structural constituent of hair, feathers, hoofs, claws, and horns. This protein makes up the dead, visible cells of the human hair shaft and nail plate.
A tough, fibrous protein that forms the main structural constituent of hair, feathers, hoofs, claws, and horns. This protein makes up the dead, visible cells of the human hair shaft and nail plate.
Quiz
Apart from human hair and nails, where else is keratin commonly found in nature?
Quiz
On average, how many hairs does a human naturally shed from their head each day?
Quiz
Which tough, fibrous protein makes up the primary structure of human hair and nails?